24 products
Sort by:
24 products
24 products
What is IO Genix Vit D3 K2?
It is a supplement that combines two fat-soluble vitamins in a single plant-based capsule: 2,000 IU of vitamin D3 and 200 µg of vitamin K2 in MK-7 form. The bottle contains 60 capsules, which is two months at one capsule a day.
The formula is pared back to the strict essentials: maltodextrin as a bulking agent, the two vitamins, and a hydroxypropyl methylcellulose shell. The latter is of plant origin, which sets this product apart from most vitamin D products on the market, often sold as bovine gelatine softgels.
Pairing D3 with K2 has become a standard in the vitamin D aisle, and the logic behind it is simple: vitamin D increases calcium absorption, vitamin K plays a part in its use in bone. Both carry authorised claims relating to bones, and that is what justifies bringing them together. The rest of the Spanish range can be found in our IO Genix aisle.
What does one capsule contain?
| Nutrient | Per capsule | % NRV | Form provided |
|---|---|---|---|
| Vitamin D3 | 2,000 IU, i.e. 50 µg | 1,000 % | Cholecalciferol |
| Vitamin K2 | 200 µg | 267 % | Menaquinone-7 (MK-7) |
Other components: maltodextrin (bulking agent), plant-based capsule (hydroxypropyl methylcellulose). NRV within the meaning of Regulation 1169/2011: 5 µg for vitamin D, 75 µg for vitamin K. The percentages above are calculated from these values, as the manufacturer does not publish them in the data provided.
Let us start with vitamin D, and say things as they are. 50 µg per capsule is ten times the nutrient reference value. The figure looks striking, but there is an explanation for it: the European NRV of 5 µg is a very low floor, and the EFSA sets 100 µg a day as the tolerable upper intake level in adults. One capsule therefore represents half that ceiling — a straightforward dose, common on this type of product, and one that stays within bounds provided you do not stack sources.
That is precisely the point to watch. If you already take a multivitamin, cod liver oil or a bone complex, add up the micrograms before adding this capsule. Vitamin D is fat-soluble: it is stored in the body, unlike vitamin C.
The authorised claims are precise, and they are more than enough on their own: vitamin D contributes to the maintenance of normal bones, to the maintenance of normal muscle function, to the normal function of the immune system, and to the normal absorption and utilisation of calcium and phosphorus. As for the second: vitamin K contributes to normal blood clotting and to the maintenance of normal bones.
On the MK-7 form, a word of honesty. It is a long-chain menaquinone, known for staying in the body longer than MK-4. We will stop there: claiming a quantified superiority would require a source we do not have, and 200 µg is a high dose for this vitamin — which is also what makes the warning about anticoagulants so important.
How should you take Vit D3 K2?
Dose: 1 capsule. Liquid: a large glass of water. Timing: during a meal containing fat, preferably in the morning or at midday. Frequency: one serving a day. Duration: continuous use is possible, particularly during periods of low sunlight.
The fatty meal is not a detail. D3 and K2 are both fat-soluble: swallowed on an empty stomach with a glass of water, part of the intake is lost. A breakfast with eggs, a few almonds, a drizzle of oil or simply a full-fat yoghurt is enough to change that. It is the most rewarding move on this whole page.
On the time of year, the manufacturer is right to insist: it is from October to April that the question really arises in France. Winter sunshine does not allow synthesis in the skin, and that is where the 60-capsule bottle makes sense — two months, to be repeated two or three times over the cold season.
Two useful combinations to know about. Magnesium is involved in vitamin D metabolism, and a proper calcium intake from food — dairy products, green vegetables, mineral waters — makes more sense than the capsule taken on its own. Zinc, for its part, can be taken at another time of day without interference.
Who is this product for, and who is it not for?
It suits adults living in a country with little winter sunshine, those who work indoors, people with darker skin who synthesise less vitamin D, and indoor athletes. As the capsule is plant-based, it is suitable for vegetarians; note, however, that vitamin D3 is most often of animal origin, and the manufacturer does not specify its source.
It is not advised for people on anticoagulant treatment — warfarin, vitamin K antagonists — without prior medical advice. This is not a token precaution: vitamin K is directly involved in clotting, and these treatments act on precisely that pathway. If this concerns you, speak to your doctor before opening the bottle, not afterwards.
The manufacturer also states that it is not suitable for pregnant or breastfeeding women, or for children, or for people on medical treatment without supervision. Traces of GLUTEN (wheat, oats), NUTS, PEANUTS, EGGS, MILK, SULPHITES, FISH and SOYA are possible.
What you should not expect from it. It is not a stimulant: you will feel nothing, and that is normal. Nor is it a product to take blindly over several years — vitamin D status can be measured in a laboratory, and if you supplement all year round, a blood test is the right way to know where you stand. Lastly, it is not a performance product: correcting a low status restores normal muscle function, it does not create extra strength in someone whose status is already adequate.
Vitamin D3 K2 or a multivitamin?
This is the choice that faces more or less everyone in autumn, and it is settled on the dose.
A multivitamin provides vitamin D, but rarely more than 5 to 25 µg, among twenty other nutrients. It is the better choice if your diet is irregular and you want broad cover without having to think about it: B vitamins, vitamin C, trace elements, everything is covered by a single capsule. Its weakness on this particular point: the vitamin D dose is often too low to count for much in the depths of winter, and vitamin K is almost always absent from it.
Vit D3 K2 does the opposite: two vitamins, at a straightforward dose, nothing else. It is the better choice if your need has been identified — a low blood test, a winter without sun, an indoor job — and if you want to manage that one line precisely. It is also the only one of the two that provides K2, which is absent from very nearly every multivitamin.
The trap to avoid is always the same: taking both without counting. A multivitamin at 25 µg plus this capsule at 50 µg is 75 µg a day, still under the ceiling of 100 µg, but adding a fortified fish oil would tip the total over. Do the sum once and it will serve you all winter.
Frequently asked questions
Is 2,000 IU a day too much?
That is 50 µg, half the tolerable upper intake level of 100 µg a day set by the EFSA in adults. It is a high dose relative to the European reference value, which is only 5 µg, but it stays within bounds as long as you do not combine several sources. The only way the question is really settled is with a blood test.
Why combine K2 with D3?
Because both vitamins carry an authorised claim on the maintenance of normal bones, and they act at different stages: D promotes calcium absorption, K plays a part in its use. That is the logic of the combination, and it is sound. We will not go beyond what the authorised wordings allow us to state.
Should it be taken in the morning or in the evening?
The manufacturer advises the morning or midday, with a meal containing fat. What matters is the fatty meal, not the hour: these are two fat-soluble vitamins, and taking them on an empty stomach appreciably reduces absorption. Choose the meal at which you eat the least lightly.
Can it be taken with an anticoagulant?
Not without medical advice. That is the manufacturer's explicit warning, and it concerns vitamin K, which is involved in blood clotting — the very pathway on which vitamin K antagonists act. This question is one for your doctor, who alone knows your treatment and how well balanced it is.
How long does a bottle last?
Two months, at the rate of one capsule a day for 60 capsules. Over a winter season from October to April, allow three bottles to cover the full period. It is the format that best matches seasonal use rather than continuous supplementation.
Is the capsule suitable for vegetarians?
The shell, yes: it is made of hydroxypropyl methylcellulose, a modified cellulose of plant origin. The manufacturer does not, however, specify the origin of the vitamin D3 itself, which is most often derived from lanolin commercially. If this point is decisive for you, check with the brand before buying.
Can it be taken all year round?
The manufacturer allows it and recommends it above all during periods of low sun exposure. Our position is more cautious: with a continuous intake of 50 µg a day for twelve months, a vitamin D blood test is the only serious way to know whether you are at the right level. In summer, sun exposure is often enough.
Where can you buy IO Genix Vit D3 K2?
The 60-capsule bottle can be ordered from this page, and we ship throughout France and Europe. It is one of the least expensive products in the aisle, and one of the few whose usefulness in winter is beyond argument at our latitudes.
At the counter in Vendargues, about ten minutes from Montpellier, the question we always ask about this product comes down to three words: what else are you taking? Many people do not realise that their multivitamin already contains some, and the sum changes the advice. The rest of the vitamins and minerals can be browsed in our sports nutrition aisle.
What is Now Foods Vitamin D3 Liquid?
Now Foods Vitamin D3 Liquid is vitamin D3 in liquid form, in a dropper bottle. Four drops provide 400 IU of cholecalciferol, that is 10 µg and 200% of the nutrient reference value. The 59 ml bottle contains around 590 drops, which amounts to 147 servings.
Vitamin D3, or cholecalciferol, is the form the skin makes for itself under the effect of ultraviolet rays. It is also the one found in oily fish and egg yolks. It differs from vitamin D2, of plant origin, which the body uses less efficiently.
The liquid form is not a presentational whim: it is what lets you adjust the dose drop by drop. Where a tablet imposes a fixed dose, a dropper lets you take anything from 400 to 2,000 IU according to your needs, without changing product. The rest of the American range can be browsed in our Now Foods section, and the other products in the category in our vitamin D section.
What is in one serving of Vitamin D3 Liquid?
| Composition | Per 4 drops | % NRV |
|---|---|---|
| Vitamin D3 (cholecalciferol) | 400 IU, that is 10 µg | 200% |
| Base | MCT oil (medium-chain triglycerides, from coconut and palm kernel) | |
| Volume | 59 ml, that is around 590 drops | |
| Servings per bottle | 147 servings of 400 IU | |
Vitamin D is the best-justified supplement in this entire catalogue for a French population, and that is not a sales argument. Between October and March, at our latitudes, the sun sits too low on the horizon for the skin to make it in useful quantities. Even in Montpellier, where sunshine is generous the rest of the year, the winter window is very real.
The authorised claims for this vitamin are numerous and solid, and there is no reason to stray from them: vitamin D contributes to normal absorption and utilisation of calcium and phosphorus, to the maintenance of normal bones, to the maintenance of normal teeth, to the maintenance of normal muscle function, to the normal function of the immune system, to the maintenance of normal blood calcium concentrations and it has a role in the process of cell division. These are the official wordings of the European framework.
The choice of MCT oil as the base is worth pausing on. These are medium-chain triglycerides, derived from coconut and palm kernel. Since vitamin D is fat-soluble, it needs a fatty carrier to be absorbed: here, that carrier is already in the bottle. It is a genuine advantage over a dry capsule, which relies on the meal to supply the fat.
The 147-serving bottle is an unusually long-lasting pack. At four drops a day, it covers close to five months — that is, the whole season in which supplementing makes the most sense.
Missing from the manufacturer's file: the origin of the cholecalciferol is not specified. Most vitamin D3 on the market is extracted from sheep lanolin, but we will not assert that here for lack of information. This product therefore cannot be presented as suitable for vegan diets.
Ingredients list
MCT oil (medium-chain triglycerides from coconut and palm kernel oil), vitamin D3 (cholecalciferol).
Free from yeast, wheat, gluten, soya, corn, milk, egg, fish and shellfish. Made in a facility that handles other ingredients containing these allergens.
How should Vitamin D3 Liquid be taken?
Dose: 4 drops, up to 20 drops a day according to your needs, that is 400 to 2,000 IU. Carrier: straight into the mouth or in a drink. Timing: during a meal containing fat, preferably breakfast or lunch. Frequency: once a day is enough, even for the full dose. Duration: from October to March at least, all year round depending on your sun exposure.
Shake the bottle before each use: the vitamin D is suspended in the oil and needs to be distributed evenly. This is a manufacturer's instruction, and it takes two seconds.
The manufacturer suggests four drops one to five times a day. In practice, nothing obliges you to split it up: vitamin D is stored in the body, and taking all twenty drops at once with the same meal comes to the same thing while being infinitely easier to keep up. That is the advice we give in the shop, and it beats a five-a-day routine abandoned within a week.
Taking it with a fatty meal counts, even with an MCT oil base. The bottle already supplies the fatty carrier, which is a real plus, but a meal containing fat remains the best context for absorption. Breakfast or lunch work well.
A small hygiene instruction that the manufacturer specifies and that is often overlooked: if the dropper touches your lips, clean it before putting it back in the bottle. On a product that lasts five months, this avoids contaminating the oil. Vitamin D combines without overlap with an omega 3, a magnesium — a mineral involved in its metabolism — or a zinc.
Who is Vitamin D3 Liquid for, and who is it not for?
It suits an adult with little sun exposure, working indoors, or going through the autumn-winter period. The liquid format is particularly well suited to those who dislike swallowing capsules, and dosing by the drop allows fine adjustment, which no tablet permits.
A healthcare professional must be consulted in the event of pregnancy, breastfeeding, drug treatment or a health problem. That is the manufacturer's instruction, and it is justified: vitamin D is fat-soluble, it is stored, and an accumulation from other sources shows up less quickly than with a water-soluble vitamin.
Check precisely what your other supplements contain. A multivitamin, a joint complex or a bone product almost always supply vitamin D, and the intakes add up. The upper safety limit set at European level for adults is 100 µg a day, that is 4,000 IU: this product's maximum dose, 2,000 IU, stays well clear of it, but the sum can change the picture quickly.
What you should not expect from it. You will feel nothing when you take it, and that is normal: no vitamin produces a sensation. It does not improve sporting performance and it makes you neither lose weight nor gain muscle. And above all, it does not replace a blood test: if you are wondering about your status, a test prescribed by your doctor will tell you what no product page can guess.
Liquid vitamin D or capsules?
The two forms are equivalent in substance — it is the same molecule — and the choice comes down entirely to practical criteria.
The liquid format has two advantages that genuinely count. The first is flexibility of dosing: four drops or twenty, you decide, whereas a tablet imposes its figure. The second is that there is no capsule to swallow, which settles the matter for anyone put off by capsules. Add to that the MCT oil base, which supplies the fatty carrier needed for absorption.
The capsule, for its part, wins on simplicity: no bottle to shake, no dropper to clean, no risk of spilling. It slips into a weekly pill organiser, which a liquid does not. And some formulas pair it with other fat-soluble vitamins, such as K2.
When is the capsule the better choice? If you already have a supplement routine in capsule form and simply want to add one line to it. If your goal is broader, a multivitamin already supplies some, in a more modest amount. And for an intake of vitamin C during the same season, a dedicated product rounds out this winter routine nicely.
Frequently asked questions
How much vitamin D per drop?
100 IU per drop, that is 400 IU for four drops, which represents 200% of the nutrient reference value. The manufacturer provides for up to 2,000 IU a day, that is twenty drops, according to individual needs.
Should the doses be split up?
That is not necessary. The manufacturer suggests four drops one to five times a day, but vitamin D is stored in the body: taking the full dose at once with the same meal comes to the same thing and is far easier to keep up over time.
Why an MCT oil base?
Because vitamin D is fat-soluble and needs a fatty carrier to be absorbed. Here, that carrier is already in the bottle, which is a genuine advantage over a dry capsule that relies solely on the meal.
How long does one bottle last?
59 ml, that is around 590 drops and 147 servings of 400 IU. At four drops a day, that comes to close to five months: enough to cover the whole October to March period without reordering. At twenty drops a day, allow one month.
Is this product suitable for vegans?
The manufacturer does not specify the origin of the cholecalciferol, and we will not invent it. Most vitamin D3 on the market comes from sheep lanolin. In the absence of information, this product cannot be presented as suitable for a vegan diet.
Is there a risk of overdose?
The upper safety limit set at European level for adults is 100 µg a day, that is 4,000 IU. The maximum dose provided for here, 2,000 IU, stays well clear of it. Do check your other supplements, though: vitamin D intakes add up and are stored.
Should it be taken all year round?
The period in which supplementing is most justified runs from October to March, the sun being too low then to allow useful production in the skin. The rest of the year depends on your actual exposure. A blood test prescribed by your doctor settles it far better than guesswork.
Where can you buy Now Foods Vitamin D3 Liquid?
You can order the 59 ml bottle on this page, and we ship throughout France and Europe. In the Vendargues shop, about ten minutes from Montpellier, this is the product we recommend most readily at the start of autumn, with one simple piece of advice: all the drops at once, at breakfast, and the bottle will see you through to spring. The rest of our selection can be browsed in the sports nutrition section.
What is TrainedByJP's D3 K2?
TrainedByJP D3 K2 combines two fat-soluble vitamins in one vegetable capsule. The vitamin D3 here is of plant origin, extracted from algae, and the vitamin K2 comes in a patented menaquinone-7 form. The bottle holds 60 capsules, at one a day: two months of use.
Pairing these two vitamins has become common in recent years, and for a precise reason. Vitamin D improves the intestinal absorption of calcium; vitamin K, for its part, is involved in the proteins that play a role in fixing it into bone. The two work on the same ground, at two different stages.
The point that really sets this product apart is the origin of the vitamin D3. In the vast majority of supplements, cholecalciferol is extracted from lanolin, the grease from sheep's wool — which rules those products out of a vegan diet. Here, the D3 comes from algae, and the capsule is made of hypromellose. The formula is therefore vegan from end to end, which remains rare. The rest of the British range can be browsed in our TrainedByJP section, and the other products in the category in our vitamin D section.
What does one D3 K2 capsule contain?
| Composition | Per capsule | Detail |
|---|---|---|
| Vitamin D3 (cholecalciferol) | dose not disclosed | of plant origin, extracted from algae |
| Vitamin K2 | dose not disclosed | menaquinone-7, patented form |
| Carrier | Maltodextrin | |
| Shell | Vegetable capsule (hypromellose) | |
| Pack size | 60 capsules, i.e. 60 servings | |
Data missing from the manufacturer's file, and it has to be said plainly: the doses of vitamin D3 and vitamin K2 per capsule have not been disclosed to us. On this type of product, those are nonetheless the only two figures that count. We will not invent them and we will not infer them from a competing product. They appear on the packaging you will receive, and this page will be updated as soon as the official values are passed on to us.
What is established, on the other hand, are the authorised claims, and they are solid for these two vitamins. For vitamin D: it contributes to the normal absorption and utilisation of calcium and phosphorus, to the maintenance of normal bones, to the maintenance of normal muscle function, to the normal function of the immune system and to the maintenance of normal blood calcium levels. For vitamin K: it contributes to normal blood clotting and to the maintenance of normal bones. These are the exact wordings of the European framework. Those claims are conditional on a minimum intake, which we cannot confirm as we do not know the doses.
A word on the form of vitamin K2 chosen: menaquinone-7, also written MK-7. It differs from MK-4 in staying present in the blood for markedly longer after being taken, which makes a single daily serving sufficient where MK-4 would call for several. It is the form most used in current supplements, and it is a coherent formulation choice.
As for algal vitamin D3, it is chemically identical to cholecalciferol from lanolin: the same molecule, obtained by another route. The difference is ethical and dietary, not biological.
List of ingredients
Plant-based vitamin D3 (cholecalciferol from algae), vitamin K2 (patented menaquinone-7), maltodextrin, vegetable capsule (hypromellose).
Data missing from the manufacturer's file: the list of allergens present in the manufacturing facility is not disclosed. Refer to the packaging you receive.
How should you take D3 K2?
Dose: 1 capsule. Liquid: a glass of water. Timing: during a meal containing fat, preferably in the morning or at midday. Frequency: one serving a day. Duration: a course of 3 months minimum, continued if needed from October to March.
Taking it with a fatty meal is not optional with this product, and it is the first thing to remember. Vitamins D and K are fat-soluble: swallowed on an empty stomach with a glass of water, a substantial part does not cross the intestinal wall. A little olive oil, half an avocado, a handful of almonds or an oily fish in the same meal is more than enough. It costs nothing, and it changes what you get out of the bottle.
The manufacturer advises the morning or midday rather than the evening. That is a preference for comfort more than a physiological constraint: some people report poorer sleep with vitamin D taken late. If that does not apply to you, the time hardly matters.
The time of year counts for more than the time of day. At our latitudes, the skin makes virtually no vitamin D between October and March, the sun being too low on the horizon. That is the window in which supplementation makes full sense, and the 60-capsule bottle covers two months of it. Even in Montpellier, where the sunshine is generous, winter is still winter.
The manufacturer suggests pairing this product with an intake of magnesium, a mineral involved in the metabolism of vitamin D. It can also be taken with the same meal as an omega 3, which provides the fatty support the two vitamins need for absorption.
Who is D3 K2 for, and who is it not for?
It is aimed first and foremost at people following a vegan or strict vegetarian diet: it is one of the few vitamin D3 products they can take, since almost the whole market comes from sheep's lanolin. It also concerns anyone with little sun exposure, working indoors, or living through the autumn-winter period in northern Europe.
It is not recommended for people on anticoagulant or vitamin K antagonist medication without prior medical advice, and that is a contraindication to take seriously. Vitamin K antagonist medicines work precisely by opposing the action of this vitamin; supplying it through a supplement can upset the balance of the treatment. If this applies to you, the question goes to your doctor before the purchase, not after.
It is not recommended for pregnant and breastfeeding women without the advice of a healthcare professional, and it is not intended for children.
What you should not expect from it. You will feel nothing when you take it, and that is normal: these two vitamins have no perceptible effect. They do not improve sporting performance, muscle mass or mood in any immediate way. And supplementation does not replace a blood test: if you are wondering about your vitamin D status, a work-up prescribed by your doctor will answer far better than a bottle bought at random. Finally, watch out for stacking: a multivitamin already contains vitamin D, and intakes add up.
D3 on its own, or D3 combined with K2?
A frequent question in the shop, and the answer depends above all on what you are looking for.
Vitamin D on its own does the main job very well: making up for the shortfall in sunshine during the cold season. It is the best-justified supplement in this whole catalogue for a European population, and it costs little. If that is your only aim, standalone vitamin D exists in a range of doses, often for a smaller budget, and a vitamin C will usefully round out the winter period.
Adding vitamin K2 answers a logic of complementarity where bone is concerned. Vitamin D promotes the absorption of calcium, vitamin K is involved in the proteins that play a role in fixing it. The combination makes sense if your concern is specifically bone capital, and it saves buying two bottles.
In which case is D3 on its own the better choice? If you are on anticoagulant medication — in which case K2 is precisely what to avoid without medical advice — or if budget is the deciding criterion. And if your aim is broader, a multivitamin already provides both, in more modest amounts. For all-round bone support, our collagen section and our zinc section rest on other mechanisms and are best read alongside.
Frequently asked questions
What are the doses of D3 and K2 per capsule?
The manufacturer has not disclosed them to us and we will not invent them. They are nonetheless the only two figures that count on this type of product. They appear on the packaging you will receive; this page will be updated as soon as the official values are passed on to us.
Is this vitamin D3 suitable for vegans?
Yes, and it is the product's main selling point. The vitamin D3 here is extracted from algae and not from sheep's lanolin, as is the case in almost every supplement on the market. The capsule is vegetable, made of hypromellose. The formula is therefore vegan from end to end.
Why take it during a fatty meal?
Because vitamins D and K are fat-soluble. Taken on an empty stomach with a glass of water, a substantial part is not absorbed. A drizzle of oil, half an avocado or a few almonds in the same meal are enough to genuinely change what you get out of the product.
Can it be taken on anticoagulants?
Not without medical advice, and the warning is categorical. Vitamin K antagonist medicines work by opposing the action of this vitamin: supplying it through a supplement can unbalance the treatment. If this applies to you, talk to your doctor before buying.
What is menaquinone-7?
It is a form of vitamin K2, written MK-7. It stays present in the blood for much longer after being taken than the MK-4 form, which makes a single daily serving sufficient. It is the form most used in current supplements.
Should it be taken all year round?
The period in which supplementation is most justified runs from October to March: at our latitudes, the skin makes virtually no vitamin D in winter, the sun being too low. The rest of the year depends on your actual exposure. If in doubt, a blood test settles it better than an assumption.
Can it be stacked with a multivitamin?
First check what your multivitamin contains: most already provide vitamin D, and intakes add up. With a fat-soluble vitamin, which is stored in the body, it is better to do the sum than to discover a build-up after several months.
Where can you buy TrainedByJP's D3 K2?
The 60-capsule bottle can be ordered from this page, and we ship throughout France and Europe. At the Vendargues shop, about ten minutes from Montpellier, it is the product we bring out when a vegan customer asks us for a vitamin D: the question of origin comes up every time, and answers are rare in this category. The rest of our selection can be browsed in the sports nutrition section.
What is Nutriting's nuADK?
Nutriting nuADK brings together three fat-soluble vitamins in a single softgel capsule. One capsule provides 2,000 IU of vitamin D3, i.e. 50 µg and 1,000% of the reference value, 600 µg of vitamin A as palmitate, and 125 µg of vitamin K2 as menaquinone-7. The 60-capsule bottle covers two months.
These three vitamins share one characteristic that explains why they are brought together: they do not dissolve in water but in fat. That is why the capsule contains an organic olive oil base — the fatty carrier is already in the product, it does not have to come from your meal.
The three doses are shown separately, which is not that common on this type of formula. You know exactly how much of each vitamin you are taking, and you can compare it with what your other supplements already provide. The rest of the French range can be browsed in our Nutriting aisle, and the other products in the category in our vitamin D aisle.
What does one nuADK capsule contain?
| Composition | Per capsule | % NRV |
|---|---|---|
| Vitamin D3 (cholecalciferol) | 50 µg, i.e. 2,000 IU | 1,000% |
| Vitamin A (palmitate) | 600 µg, i.e. 2,000 IU | 75% |
| Vitamin K2 (menaquinone-7, MK-7) | 125 µg | 166% |
| Base | Organic olive oil | |
| Shell | Marine gelatine, glycerol, water | |
| Pack size | 60 softgel capsules, i.e. two months of use | |
The 2,000 IU of vitamin D3 is the most common dose in winter supplementation protocols, and it is a sound choice. It stays well below the upper safety limit set at European level, at 100 µg per day, i.e. 4,000 IU. The claims attached to it are wide-ranging: vitamin D contributes to the normal absorption and utilisation of calcium and phosphorus, to the maintenance of normal bones, to the maintenance of normal muscle function and to the normal function of the immune system.
Vitamin K2 in the MK-7 form is the form that stays in the blood longest, the one that makes a single daily dose enough. Vitamin K contributes to normal blood clotting and to the maintenance of normal bones. It logically complements vitamin D on the bone front: one promotes calcium absorption, the other is involved in the proteins that take part in fixing it.
Vitamin A, at 600 µg, covers 75% of the reference value. Vitamin A contributes to the maintenance of normal vision, normal skin and normal mucous membranes, to normal iron metabolism and to the normal function of the immune system. The dose is deliberately measured: vitamin A is stored in the liver and an excess of it is not harmless, which is why it is kept below the reference value here rather than above it.
There is one point of composition that rules out a proportion of buyers and therefore has to be said straight away: the shell is made of marine gelatine. This capsule therefore contains a fish-derived product, which makes it an allergen subject to mandatory declaration, and it is suitable neither for vegetarians nor for vegans. The manufacturer does, on the other hand, declare it free from gluten, lactose, soya, nanoparticles and GMOs, with an olive oil base from organic farming.
Ingredients list
Shell: MARINE GELATINE, glycerol (thickener), water (carrier). Contents: organic olive oil, vitamin K2 (menaquinone-7), vitamin D3 (cholecalciferol), vitamin A palmitate.
Contains a FISH-derived product. Free from gluten, lactose, soya, nanoparticles and GMOs.
How do you take nuADK?
Dose: 1 capsule. Liquid: a glass of water. Timing: no restriction — the capsule already contains its own oily base. Frequency: one dose a day. Duration: from October to April, extendable to the whole year if you get little sun exposure.
This is one of the few products in this aisle where the time of day makes no difference at all, and that is a genuine practical advantage. Most fat-soluble vitamins need a fatty meal to be absorbed; here, the olive oil in the capsule already supplies that carrier. You can therefore take it on an empty stomach, at the office, at any hour, without losing any benefit. On a product to be taken every day for six months, that freedom is the difference between a course you stick to and a course you abandon.
The October-to-April window matches the period when sunlight in France is no longer enough for the skin to make sufficient vitamin D. That is when supplementation makes the most sense, and the 60-capsule bottle covers two months of it: so allow three bottles for the full season. If you work indoors or rarely go out, taking it all year round is justified.
The manufacturer gives a piece of advice that few brands dare to give, and it deserves to be followed: have your blood level measured. A 25(OH)D test, four to six weeks after starting supplementation, lets you adjust the dose rather than guess it. The manufacturer mentions a target of between 30 and 40 ng/ml. It is your doctor who prescribes and who interprets, but the idea is an excellent one: it turns an assumption into a figure.
This product combines without any overlap with a magnesium, a mineral involved in vitamin D metabolism, or with an omega 3. Do take care, on the other hand, not to stack it with a multivitamin that already contains these three vitamins.
Who is nuADK suitable for, and who is it not suitable for?
It is aimed at an adult who gets little sun exposure, particularly between October and April, and who would rather have a single capsule than three separate bottles. The freedom over when to take it makes it an easy product to fit into any routine.
It is not recommended for people on anticoagulant treatment, warfarin or equivalent, without prior medical advice. The manufacturer says so clearly, and it is the main warning on this page: vitamin K2 can interact with these treatments and reduce their effectiveness. If you have a heart condition, a doctor's advice is likewise required before taking it.
It contains a fish-derived product, the gelatine in the shell being of marine origin. People with a fish allergy must rule it out, and it is suitable neither for vegetarians nor for vegans.
Pregnant or breastfeeding women should seek the advice of a healthcare professional before use. The presence of vitamin A as palmitate makes this precaution particularly important during pregnancy, a period when retinol intakes are subject to specific recommendations. This is not a formula to take as a matter of course: ask the question beforehand, not afterwards.
What not to expect from it. No sensation when you take it: these three vitamins have no perceptible effect. No effect on sporting performance, muscle mass or body fat. And above all, no dose replaces a blood test: if you want to know where you stand, what you need is a test, not an assumption.
An A, D3 and K2 complex or vitamin D on its own?
This is the question that decides the purchase in this aisle, and the answer is not the same for everyone.
Vitamin D on its own does most of the work: making up for the lack of sunshine in the cold season. It is inexpensive, available as capsules, drops or tablets, and its regulatory framework is excellent. If that is your only goal, it is more than enough, and you run no risk of an interaction with vitamin K.
This complex adds two things. Vitamin K2 complements vitamin D on the bone front, which makes sense if your concern is specifically about bone capital. Vitamin A widens the spectrum further — vision, skin, mucous membranes, immunity — at a dose deliberately kept measured at 75% of the reference value.
When is vitamin D on its own the better choice? If you take an anticoagulant, the question is settled: K2 is to be avoided without medical advice, and an isolated D3 product is the one to go for. The same applies if you are vegetarian or allergic to fish, since the marine gelatine rules this capsule out. For broader bone support, our collagen aisle and our zinc aisle provide other building blocks, and our vitamin C aisle the cofactor for collagen synthesis.
Frequently asked questions
How much vitamin D per capsule?
50 µg, i.e. 2,000 IU and 1,000% of the nutrient reference value. It is the most common dose in winter supplementation protocols, and it stays well below the European upper safety limit, set at 4,000 IU per day in adults.
Does it have to be taken with a meal?
It does not, and that is the practical strength of this formula. The capsule contains an organic olive oil base that already supplies the fatty carrier these three vitamins need. You can therefore take it at any time of day, with or without food.
Is this capsule suitable for vegetarians?
No. The shell is made of marine gelatine, so the product contains a fish derivative, an allergen subject to mandatory declaration. It is suitable neither for vegetarians, nor for vegans, nor for people with a fish allergy.
Can it be taken while on anticoagulants?
Not without prior medical advice, and that is the product's main warning. Vitamin K2 can interact with warfarin and equivalent treatments and reduce their effectiveness. If you have a heart condition, medical advice is likewise required.
Why is vitamin A dosed at only 75%?
Because vitamin A is stored in the liver and an excess of it is not harmless. Staying below the reference value rather than going above it is a cautious choice, and it is also what makes it all the more important to check your other supplements before stacking them.
Should you have a blood test?
The manufacturer recommends it, and it is good advice: a 25(OH)D test four to six weeks after starting the course lets you adjust the dose instead of guessing it. The target mentioned is between 30 and 40 ng/ml. Prescribing and interpreting are your doctor's business.
How long does one bottle last?
60 capsules at one a day: exactly two months. As the recommended period runs from October to April, allow three bottles to cover the whole season. Taking it all year round is justified if you get very little sun exposure.
Where can you buy Nutriting nuADK?
The 60-capsule bottle can be ordered from this page, and we ship throughout France and Europe. At the Vendargues shop, about ten minutes from Montpellier, this is the product we bring out for customers who were taking three separate bottles, with two questions always asked first: anticoagulants, and fish allergy. The two answers decide the advice. The rest of our selection can be browsed in the sports nutrition aisle.
What is Nutriting nuADK Drops?
Nutriting nuADK Drops is a liquid food supplement combining three fat-soluble vitamins — A, D3 and K2 — in a 20 ml dropper bottle, roughly 500 drops. It comes from Nutriting, a French brand, and the manufacturer states French production.
The ingredients list runs to four lines: organic olive oil, vitamin K2 as menaquinone-7 (MK-7), vitamin D3 as cholecalciferol, and vitamin A palmitate. Nothing else — no colouring, no titanium dioxide, no tablet excipient. The manufacturer declares a formula free from gluten, free from allergens subject to mandatory labelling, free from nanoparticles, free from heavy metals, free from GMOs and not irradiated.
The olive oil is not a presentational detail: these three vitamins are fat-soluble, they dissolve in a fatty medium and not in water. The drop format also lets you adjust the dose one unit at a time, which a tablet does not. One point of origin worth knowing: vitamin D3 is extracted from lanolin, the grease from sheep's wool. The formula is therefore suitable for vegetarians, but not for vegans. The whole section is presented in our vitamin D collection, which sets out the French intake benchmarks and the difference between D2 and D3.
What does one dose of nuADK contain?
The label is written for 8 drops, i.e. 0.32 ml, which is the adult dose. That dose provides 50 µg of vitamin D3 (2,000 IU), 600 µg of vitamin A (2,000 IU) and 125 µg of vitamin K2 MK-7. One drop therefore provides 6.25 µg of vitamin D3, i.e. 250 IU.
The conversion to remember when reading any label: 1 µg of vitamin D is worth 40 IU. The 2,000 IU stated therefore does indeed correspond to 50 µg.
| Nutrient | 2 drops (3-10 years) | 4 drops (10-18 years)* | 8 drops (adult) | % NRV for 8 drops |
|---|---|---|---|---|
| Vitamin A (palmitate) | 150 µg / 500 IU | 300 µg / 1,000 IU | 600 µg / 2,000 IU | 75% |
| Vitamin D3 (cholecalciferol) | 12.5 µg / 500 IU | 25 µg / 1,000 IU | 50 µg / 2,000 IU | 1,000% |
| Vitamin K2 (MK-7) | 31.25 µg | 62.5 µg | 125 µg | 166% |
| % NRV vitamin A | 18.75% | 37.5% | 75% | — |
| % NRV vitamin D | 250% | 500% | 1,000% | — |
| % NRV vitamin K | 41.5% | 83% | 166% | — |
* The 4-drop column is calculated: the manufacturer publishes only the 2-drop and 8-drop columns. The nutrient reference values used are those of the European regulation: 800 µg for vitamin A, 5 µg for vitamin D, 75 µg for vitamin K. The high percentage on vitamin D comes from that NRV of 5 µg, well below the nutritional reference of 15 µg a day adopted by ANSES for adults — it is an artefact of how the label is read, not a sign of overdosing.
All these levels exceed the 15% NRV threshold that governs the use of European claims. The authorised wordings, to the word, are as follows. Vitamin D contributes to the normal absorption and utilisation of calcium and phosphorus, to normal blood calcium levels, to the maintenance of normal bones, to the maintenance of normal muscle function, to the maintenance of normal teeth, to the normal function of the immune system, and has a role in the process of cell division. Vitamin K contributes to the maintenance of normal bones and to normal blood clotting. Vitamin A contributes to the maintenance of normal vision, to the normal function of the immune system, to the maintenance of normal mucous membranes, to the maintenance of normal skin, to normal iron metabolism, and has a role in the process of cell specialisation.
These formulations speak of maintenance and of normal function: they do not say that the product treats anything at all. And the widespread idea that K2 "directs" calcium towards the bones rather than the arteries remains a research hypothesis, not an authorised claim.
How do you take nuADK Drops?
The manufacturer gives a dose by age bracket, as a single daily serving: 2 drops a day from 3 to 10 years, 4 drops a day from 10 to 18 years, 8 drops a day from 18 years. The frequency is therefore one serving a day, and the volume of liquid does not come into it: the drops go onto a spoon, into a food or straight into the mouth.
On duration, the manufacturer recommends daily use at the very least from October to April, the period when skin synthesis is low at our latitudes. Continuous use all year round is open to discussion depending on lifestyle, and that decision is taken with a healthcare professional.
One practical tip the label does not give: take the drops during a meal containing fat. The olive oil in the bottle already supplies a lipid context, but the absorption of fat-soluble vitamins is still better when the stomach holds a proper meal. Finally, add up your sources: many multivitamins already contain vitamin D and vitamin A.
Who is nuADK for, and who is it not for?
It is aimed at adults, and the manufacturer allows it from 3 years at the reduced doses given above. Any supplementation of a child or an adolescent is nonetheless decided with the doctor who follows them.
Three situations call for caution, and the first is firm. The product is not advised for people on anticoagulant treatment: vitamin K interferes directly with vitamin K antagonists. If this applies to you, set this formula aside and talk to your doctor about it. Next, pregnant and breastfeeding women must seek the advice of a healthcare professional before any supplementation — preformed vitamin A intake is subject to particular monitoring during pregnancy. Finally, medical advice is essential in cases of kidney failure, kidney stones, known hypercalcaemia or sarcoidosis, or while taking thiazide diuretics, corticosteroids or digitalis drugs.
One safety figure to keep in mind, because it is useful: the European upper limit for vitamin D is 100 µg a day (4,000 IU) in adults, from all sources combined. The 8 drops provide 50 µg of it, half that ceiling. There is room to spare, then, provided you count what your other products already contribute.
What you should not expect from this page: a list of deficiency signs. The symptoms mentioned all over the place are too commonplace and too widely shared with other situations to let anyone at all draw a conclusion. Deciding on a blood test, interpreting it and choosing a corrective dose are medical acts. A supplement secures an intake in a healthy person; it diagnoses nothing.
nuADK or vitamin D on its own?
There is a case for both, and the choice depends on what you already take.
Vitamin D on its own is the better choice in three clear cases. On vitamin K antagonist anticoagulants, it is the only possible option, since K2 has to be ruled out. If you already take a multivitamin containing vitamin A, it avoids stacking two retinol intakes without meaning to. And if you want to fine-tune the vitamin D dose without moving the other two, a single-nutrient formula is simpler to adjust. Our vitamin D section brings these products together.
There is a case for nuADK when you are starting from scratch and looking for a single daily serving covering all three vitamins at once, when several age groups are supplementing in the same household at different doses — the drop format handles that, a tablet does not — or when you prefer an oil base to a dry excipient. Let us note what it does not do: it provides no magnesium, the cofactor of the enzymes that convert vitamin D, no omega 3, no vitamin C and no vitamin E, the fourth fat-soluble vitamin missing from this formula.
Frequently asked questions
How many drops of nuADK a day by age?
Two drops from 3 to 10 years, four from 10 to 18 years, eight from 18 years, as a single daily serving. These three doses come from the manufacturer. For a child or an adolescent, have the decision and the dose confirmed by the doctor who follows them before starting.
How long does a 20 ml bottle last?
The bottle holds roughly 500 drops. At the adult dose of 8 drops a day, that comes to about sixty days; at 4 drops, around 125 days; at 2 drops, around 250 days. A course from October to April at the adult dose therefore takes about three bottles.
What do 8 drops represent in international units?
2,000 IU of vitamin D3 and 2,000 IU of vitamin A. The conversion is 1 µg to 40 IU for vitamin D, which does indeed give 50 µg. For vitamin A the conversion differs, since it is retinol: 600 µg corresponds to 2,000 IU. One drop provides 250 IU of vitamin D3.
Why is there vitamin A in a D3 and K2 formula?
Because all three are fat-soluble and lend themselves to the same oil base, and because vitamin A has authorised claims of its own, notably on vision and the immune system. Take care, though, if you already take a multivitamin: retinol intakes add up, and it is the only one of the three for which that addition deserves real vigilance.
Can nuADK be taken while on anticoagulants?
No. The manufacturer explicitly advises against it, and the reason is well documented: vitamin K interferes with vitamin K antagonist anticoagulants and upsets the balance of the treatment. That holds for every formula containing K2, not only this one. If you are on treatment, talk to your doctor before considering any supplementation.
What is vitamin K2 for and where is it found in food?
Menaquinone-7 activates vitamin K-dependent proteins, among them osteocalcin, which is involved in bone mineralisation. The claims adopted are normal bones and normal blood clotting. On the plate, K2 comes mainly from fermented foods — Japanese natto is the richest source — and from certain matured cheeses and animal products.
Is nuADK suitable for vegans?
No. Vitamin D3 is extracted from lanolin, the wool grease recovered at shearing: the animal is not slaughtered, but the product remains of animal origin. The manufacturer states that the formula is suitable for a vegetarian diet. If you follow a vegan diet, look for a D3 derived from lichen, chemically identical but of plant origin.
Should it be taken during a meal?
Yes, preferably, and preferably a meal containing fat. The olive oil in the bottle already provides a lipid base, which is a real advantage over a dry tablet, but absorption is still better when the serving accompanies a proper meal. The time of day, morning or evening, makes no demonstrated difference.
Where can you buy Nutriting nuADK Drops?
This page lets you order the 20 ml bottle, and we ship throughout France and Europe. In our Vendargues shop, about ten minutes from Montpellier, we take the time to do the sums with you: if you already take a multivitamin, you need to know how much vitamin D and how much retinol it contains before adding this bottle. We will gladly tell you what a product contains and how to take it; we will not tell you whether you are short of it, that question belonging to your doctor. The rest of our micronutrition is listed in the sports nutrition section.
Sources: ANSES for the French nutritional references, EFSA for the opinions underpinning the authorised claims and the upper safety limit.
Qu'est-ce que la Vitamine D3 liposomale d'Osavi ?
C'est la vitamine D3 d'Osavi en version liposomale. Une gélule apporte 4000 UI de vitamine D3 (cholécalciférol) encapsulée dans des liposomes, la matière première Liposovit®-D3.
La vitamine D contribue au fonctionnement normal du système immunitaire, au maintien d'une ossature et d'une dentition normales, à une fonction musculaire normale, à l'absorption et à l'utilisation normales du calcium et du phosphore, au maintien d'une calcémie normale, et elle joue un rôle dans le processus de division cellulaire.
Qu'apporte la forme liposomale ?
Un liposome est une vésicule construite avec les mêmes matériaux que les membranes de nos cellules : des phospholipides, ici issus de la lécithine de tournesol. L'actif y est enfermé plutôt que simplement mélangé à une poudre.
Osavi emploie une technologie liposomale sèche, ce qui permet de présenter le produit en gélule plutôt qu'en flacon liquide : plus simple à doser, à transporter, et sans goût.
La vitamine D est liposoluble : sans matière grasse, son absorption est limitée. C'est précisément le problème que l'encapsulation cherche à contourner, et la raison pour laquelle une vitamine D classique se prend au cours d'un repas contenant un corps gras.
Pourquoi cette marque plutôt qu'une autre
Sur un rayon où tout le monde écrit « haute qualité », Osavi accepte de se faire contredire par un document. Chaque lot est analysé par un laboratoire extérieur, J.S. Hamilton ou GBA, sur la teneur en substances déclarées, les métaux lourds et la pureté microbiologique — et le certificat d'analyse est publié. Le logo « Lab Tested » de l'étiquette renvoie à ce contrôle.
S'y ajoutent des procédés certifiés ISO 9001:2015 et ISO 22000:2018, et une liste d'ingrédients volontairement courte : pas d'arôme de synthèse, pas de colorant, pas de charge inutile.
Questions fréquentes
Qu'est-ce que le Liposovit®-D3 ?
La matière première liposomale d'Osavi : le cholécalciférol est encapsulé dans des liposomes de phospholipides de lécithine de tournesol, avec de la maltodextrine, de la gomme d'acacia comme stabilisant, du glycérol comme support et du DL-alpha-tocophérol comme antioxydant.
Faut-il la prendre avec un repas gras ?
Le fabricant indique simplement « après un repas ». La forme liposomale est justement conçue pour réduire la dépendance à la présence de matière grasse, contrairement à une vitamine D huileuse classique.
Quelle différence avec une vitamine D3 en gouttes ou en softgel ?
Le support. Les gouttes et les capsules molles utilisent une huile ; ici l'actif est encapsulé en liposomes dans une gélule sèche. Notre rayon vitamine D regroupe les deux approches.
Que signifie « Lab Tested » sur le flacon ?
Que le lot a été analysé par un laboratoire indépendant — J.S. Hamilton ou GBA — sur sa composition, les métaux lourds et la pureté microbiologique, et qu'un certificat d'analyse est publié pour le produit. C'est la marque de fabrique d'Osavi.
Où acheter la Vitamine D3 liposomale Osavi ?
Vous pouvez le commander sur cette page, et nous expédions partout en France et en Europe. Toute la gamme est sur notre page Osavi, et notre rayon vitamine D permet de comparer les étiquettes.
Un multivitamines à croquer, goût orange
Kid Vits réunit dix-sept vitamines et minéraux dans un comprimé à croquer aromatisé à la poudre de jus d'orange. La formule est conçue pour l'enfant à partir de quatre ans : deux comprimés par jour.
Le sucrant associe du sucre de canne et de l'extrait de feuille de stévia, pour 1 g de sucres par dose. La vitamine A est apportée à 100 % sous forme de bêta-carotène, le fer sous forme de glycinate (Albion™) et le zinc sous forme de bisglycinate.
Le flacon de 120 comprimés représente 60 doses, soit deux mois.
Composition par 2 comprimés à croquer
Autres ingrédients : sucre de canne, cellulose microcristalline, sorbitol, poudre de jus d'orange, acide stéarique d'origine végétale, acide L-malique, arômes naturels, maltodextrine (non-OGM), dioxyde de silicium, amidon de tapioca modifié, gomme d'acacia, alginate, concentré de balle de riz, amidon de pois, acide citrique, extrait de feuille de stévia (rébaudioside A), éthylcellulose, glycérine, hypromellose, tocophérols mélangés (tournesol), triglycérides à chaîne moyenne.
Sans blé, gluten, soja, lait, œuf, poisson, crustacés ni sésame ajoutés.
Questions fréquentes
À partir de quel âge ?
4 ans. Le produit n'est pas destiné aux enfants plus jeunes.
Combien de sucre par dose ?
1 g de sucres pour deux comprimés. Le reste du goût sucré vient de l'extrait de feuille de stévia et du sorbitol.
Quelle forme de vitamine A ?
100 % bêta-carotène, un précurseur végétal que l'organisme convertit selon ses besoins.
Pourquoi des minéraux sous forme de glycinate ?
Le fer et le zinc sont ici chélatés à un acide aminé (procédé Albion™), une forme choisie par NOW Foods pour sa tolérance digestive.
Un comprimé à croquer, sans eau
La vitamine D3 — cholécalciférol — est la forme que la peau synthétise sous l'effet du soleil, et celle que l'alimentation apporte par les poissons gras. Aux latitudes françaises, la synthèse cutanée est faible d'octobre à mars.
NOW Foods la propose ici en comprimé à croquer, à 25 µg par comprimé, soit 1 000 unités internationales. La forme à croquer dispense d'un verre d'eau et convient à ceux qui n'avalent pas facilement les gélules.
Le comprimé est sucré au xylitol et au sorbitol, sans sucre ajouté, et coloré à la poudre de betterave. Le flacon de 180 comprimés couvre six mois.
Composition par comprimé à croquer
Autres ingrédients : xylitol, sorbitol, hydroxypropylcellulose, cellulose microcristalline, arômes naturels, poudre de betterave, amidon modifié, acide stéarique d'origine végétale, palmitate d'ascorbyle, maltodextrine, acide citrique, dioxyde de silicium.
Sans blé, gluten, soja, lait, œuf, poisson, crustacés, fruits à coque ni sésame ajoutés.
La vitamine D contribue au maintien d'une ossature et d'une dentition normales, à l'absorption et à l'utilisation normales du calcium et du phosphore, à une fonction musculaire normale, au fonctionnement normal du système immunitaire et au maintien de concentrations normales de calcium dans le sang. Elle joue un rôle dans le processus de division cellulaire.
Questions fréquentes
Pourquoi un comprimé à croquer ?
Pour se passer d'un verre d'eau et faciliter la prise, notamment chez les personnes qui avalent difficilement les gélules ou les capsules molles.
1 000 UI, cela correspond à combien de microgrammes ?
À 25 µg. Le facteur de conversion est de 0,025 µg par unité internationale.
Le comprimé contient-il du sucre ?
Pas de sucre ajouté. Le goût sucré vient du xylitol et du sorbitol, deux polyols.
Pourquoi le prendre avec un repas gras ?
La vitamine D est liposoluble : la présence de matières grasses dans le repas améliore son absorption.
Le xylitol pose-t-il un problème ?
Pour l'humain, non, hors consommation excessive qui peut avoir un effet laxatif. En revanche le xylitol est toxique pour les chiens : le flacon doit rester hors de portée des animaux.
What is the purpose of vitamin D in the body?
Vitamin D isn't really a vitamin; it's a prohormone. Ingested or synthesized by the skin, it becomes 25-hydroxyvitamin D in the liver—the storage form measured in the blood—and then calcitriol in the kidneys, which is the active form. Calcitriol acts on receptors throughout the body and, notably, controls intestinal calcium absorption. Seven health claims are authorized at the European level, with regulated wording:
- "Vitamin D contributes to the normal absorption and utilization of calcium and phosphorus."
- "Vitamin D contributes to normal blood calcium levels."
- "Vitamin D contributes to the maintenance of normal bones."
- "Vitamin D contributes to the maintenance of normal muscle function."
- "Vitamin D contributes to the maintenance of normal teeth."
- "Vitamin D contributes to the normal function of the immune system."
- "Vitamin D plays a role in the process of cell division."
These claims can only be used if the product is at least a "source of vitamin D," meaning 15% of the nutrient reference value: since the NRV is 5 µg, this means 0.75 µg per serving. Note what they do not say: they speak of maintenance and normal function, never of treating illnesses.
Why isn't the sun enough from October to March?
The skin produces vitamin D3 from a cholesterol precursor, 7-dehydrocholesterol, under the effect of UVB rays—the fraction of solar radiation between 290 and 315 nanometers, which is most easily blocked by the atmosphere. This is where latitude comes in. Metropolitan France extends from approximately 41° to 51° north: in winter, the sun never rises high above the horizon there, its rays pass through a much greater thickness of atmosphere than in summer, and the ozone layer absorbs most of the UVB before it reaches the ground. From October to March, cutaneous synthesis thus becomes marginal in Lille as in Lyon, a little less early and for a shorter time in Montpellier. It's not a matter of temperature: a bright and freezing winter day doesn't produce more vitamin D than a gray day.
Three additional factors play a role all year round: glass blocks UVB, melanin filters radiation in darker skin, and synthesis capacity decreases with age.
ANSES recommends exposing arms and face for 15 to 20 minutes in the late morning or afternoon during the warmer months, without negating skin cancer prevention guidelines. In terms of diet, intake remains low—fatty fish, cod liver oil, egg yolk, fortified dairy products—and ANSES estimates the average intake for adults in France at around 3.1 µg per day. It is this deficiency that raises the question of winter supplementation.
Vitamin D2 or D3, and where does D3 come from?
Vitamin D2 (ergocalciferol) comes from yeasts or fungi exposed to UV. Vitamin D3 (cholecalciferol) is the form the body produces itself: at the same dose, it raises and maintains blood levels of 25-hydroxyvitamin D more effectively than D2, which has made it the standard in supplements.
Its origin remains. Classic D3 is extracted from lanolin, the wool grease from sheep shorn: the animal is not slaughtered, but the product is not vegan for all that. The alternative is D3 from lichen (Cladonia rangiferina), chemically identical but of plant origin; relevant labels specify this, often with the mention "vegan." In its absence, it is almost always lanolin. As the extraction yield from lichen is lower, these versions cost more.
What are the official intake benchmarks in France?
The nutritional reference for the population established by ANSES is 15 µg per day for adults, or 600 IU. The conversion to remember when reading a label: 1 µg = 40 IU. A dosage of 1,000 IU is therefore 25 µg, 2,000 IU is 50 µg.
Regarding the upper limit, the safe upper limit adopted at the European level is 100 µg per day (4,000 IU) for adults, from all sources combined: including food, supplements, and medications. It is lower for children, and much lower for infants. This is not a target but a threshold not to be crossed without medical supervision.
Two additional claims come with specific conditions. For seniors: "Vitamin D helps reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures in men and women aged 60 and over" — starting from 20 µg per day, for this age group only. For children: "Vitamin D is necessary for normal bone growth and development in children." This last one does not concern us: ANSES recommends using prescribed medications for infants and young children. This section is for adults.
Why is vitamin D combined with K2 and magnesium?
Vitamin K2 (menaquinone, most often MK-7) activates vitamin K-dependent proteins, including osteocalcin, involved in bone mineralization. The accepted claim is "Vitamin K contributes to the maintenance of normal bones," usable from 11.25 µg per serving. The widespread idea that K2 "directs" calcium towards bones rather than arteries remains a research hypothesis. One safety point, however, is established: vitamin K interferes with vitamin K antagonist anticoagulants. Anyone concerned should avoid D3+K2 formulas and discuss it with their doctor.
Magnesium acts as a cofactor for the enzymes that hydroxylate vitamin D in the liver and kidneys—this is biochemistry, not a promise of effect. The authorized claims for it are "Magnesium contributes to the maintenance of normal bones" and "Magnesium contributes to normal muscle function," from 56.25 mg per serving. As intake is often just right in France, the magnesium section has its place here, as do ZMA formulas that combine it with zinc. Nothing is mandatory: D3 alone remains consistent. If you combine, do the math—many multivitamins already contain it.
Oily drops or tablets: which to choose?
Vitamin D is fat-soluble: regardless of the form, take it with a meal containing fats. On an empty stomach or with a fat-free breakfast, absorption is less effective.
Oily drops and sprays deliver the vitamin already dissolved in a fatty substance—olive oil, coconut oil, medium-chain triglycerides. This is the most flexible form for dosing and the simplest for those who have difficulty swallowing capsules; the bottle should be stored away from light. Dry tablets and capsules are easier to transport and offer perfectly reproducible dosing, with good absorption if taken with a proper meal. Daily intake is easier to maintain than a large weekly dose. Highly dosed ampoules sold in pharmacies are prescription medicines: they do not fall under this category.
What risks should be known before supplementing?
The risk of overdose is real, precisely because vitamin D is fat-soluble. Unlike vitamin C or B vitamins, whose excess is excreted in the urine, it accumulates in fatty tissues and the liver. Prolonged excessive intake leads to hypercalcemia, with a risk of calcification of kidney and cardiovascular tissues. The rule: respect the dose on the label, do not stack sources, and never exceed 4,000 IU per day on your own initiative.
Medical advice is essential before any supplementation in case of pregnancy or breastfeeding; for infants, children, and adolescents; in case of kidney failure, kidney stones, known hypercalcemia, sarcoidosis, or another granulomatous disease; when taking vitamin K antagonist anticoagulants, especially with a formula containing K2; when taking thiazide diuretics, corticosteroids, or digitalis; and for individuals being treated for a bone pathology.
Finally, the most important point on this page: anything related to deficiency is a matter for a doctor. Deciding on a blood test, interpreting it, choosing a corrective dose, and monitoring it are medical acts. A supplement is not a diagnostic tool.
Is vitamin D of interest to athletes?
What we know: vitamin D status is, on average, lower in athletes who train indoors—strength training, gymnastics, combat sports, indoor swimming—and it decreases in almost everyone in winter. The claims "normal muscle function" and "normal bones" are not insignificant in high-impact activities.
What we don't know: there is no evidence to suggest that additional intake improves strength, endurance, or recovery in an athlete whose status is already adequate. Studies on performance are heterogeneous, and the effect, when it appears, concerns individuals who started from very low levels. Vitamin D is part of the nutritional foundation, alongside omega-3s, not a performance arsenal. It does not replace glucosamine or collagen, and for muscle mass, training and proteins do the work—our sports nutrition guide positions each product.
Frequently Asked Questions
What vitamin does the sun provide?
Vitamin D, and only vitamin D. Under the effect of UVB rays, the skin converts a cholesterol precursor into vitamin D3—exactly the same molecule as in supplements. This is the only vitamin the body produces this way, which explains its special status: neither quite a vitamin, nor quite a hormone. Three useful clarifications. It's UVB that counts, not heat or brightness: a bright winter day produces almost none. Glass blocks them: behind a window or windshield, synthesis is nil. And in our latitudes, it becomes marginal from October to March, no matter the weather.
What is the role of vitamin D?
Its central role is to control the intestinal absorption of calcium and phosphorus, and thus the mineralization of bones and teeth. However, its receptors are present in almost all tissues, which explains the seven authorized European claims: normal absorption of calcium and phosphorus, normal blood calcium levels, maintenance of normal bones, teeth, and muscle function, normal immune system function, and a role in cell division. Technically, it is not a vitamin but a prohormone: transformed in the liver and then in the kidneys, it then acts as a hormone throughout the body.
What is the daily dose of vitamin D for adults?
The ANSES nutritional reference for adults is 15 µg per day, or 600 IU. Remember the conversion, it allows you to read any label: 1 µg is 40 IU, so 1,000 IU is 25 µg and 2,000 IU is 50 µg. The European upper safety limit is set at 100 µg per day, or 4,000 IU, from all sources combined—including food, supplements, and medications. This is not a target, but a ceiling not to be exceeded without supervision. A dose intended to correct a low level should be decided with a doctor and not from a product sheet.
What time of day should vitamin D be taken?
The time of day matters little, the meal matters a lot. Vitamin D is fat-soluble: its absorption depends on the lipids present in the stomach at the same time. Take it with lunch or dinner, as long as the meal contains fats; on an empty stomach or with a fat-free breakfast, part of the dose is lost. Morning or evening makes no proven difference, contrary to what is sometimes read. A regular daily intake is easier to maintain over time than a large weekly dose, and it is regularity that counts over several months.
How to get vitamin D?
Through three channels, only one of which is truly effective in winter. First, the sun: exposing arms and face for 15 to 20 minutes in the late morning or afternoon during the warmer months is enough to cover a good part of the needs—but synthesis becomes marginal from October to March in our latitudes, and sun protection guidelines remain valid. Next, diet: fatty fish twice a week, egg yolk, liver, fortified products. This is the most neglected channel, but also the most limited—ANSES estimates the average dietary intake for adults in France at about 3.1 µg per day, far from the reference 15 µg. Finally, supplementation, which makes sense during the autumn-winter period. None of these three levers precludes medical advice if you suspect a real deficiency.
What foods contain vitamin D?
A short list, and that's the problem. At the top, cod liver oil, far above everything else. Then come fatty fish—herring, mackerel, sardine, salmon, anchovies—then liver, egg yolk, some cheeses, and fortified dairy products. Mushrooms exposed to ultraviolet light provide vitamin D2, which is less effective than D3 in raising blood levels. That's all: no other food family contains it in useful quantities. Two servings of fatty fish per week are the most effective dietary lever. Exact contents can be checked on the ANSES Ciqual table.
What fruit or vegetable contains vitamin D?
None, and that's the honest answer to a frequently asked question. Neither fruits nor vegetables provide vitamin D in useful quantities: the molecule is of animal or fungal origin. The only plant exception: mushrooms exposed to ultraviolet light, which produce vitamin D2. A vegan diet therefore particularly exposes one to deficiency, and supplementation becomes a full-fledged topic—with lichen-derived D3 if you exclude lanolin.
What is the best vitamin D?
D3 (cholecalciferol) rather than D2: at the same dose, it raises and maintains blood levels better. Beyond this choice, three label lines differentiate two products. The dose displayed in micrograms AND IU, without which comparison is impossible. The origin of D3: lanolin in the vast majority of cases, lichen for plant-based versions—chemically identical, more expensive. Finally, the galenic form: oily drops allow for fine dose adjustment, while capsules are easier to transport. A very high-dose product is not "better": beyond 4,000 IU per day, it falls outside the scope of self-medication.
How to fix vitamin D, and can it be combined with magnesium?
Two concrete levers. The first is a fatty meal: without lipids, absorption drops, regardless of product quality. The second is magnesium, a cofactor for enzymes that transform vitamin D in the liver and then in the kidneys. Taking them together poses no problem, and there's no need to space them out. Beyond that, no problematic interaction is documented at usual doses with common micronutrients; the only precaution is accounting—add up the vitamin D intake from all your products. Our iron and vitamin E sections complete the range.
What are the signs of vitamin D deficiency?
This is the most frequently asked question on the subject, and one we will not answer with a list. The signs mentioned everywhere—fatigue, widespread pain, low mood, muscle weakness—are too common and shared with other conditions to allow anyone to conclude. Only a doctor, with a 25-hydroxyvitamin D blood test if deemed useful, can answer. Interpreting the result, choosing a corrective dose, and monitoring it are medical acts. A food supplement ensures adequate intake for a healthy person; it diagnoses nothing and never replaces a prescription.
Does a lack of vitamin D cause weight gain?
The link exists in the data, but not in the way one might imagine. Vitamin D is stored in adipose tissue: for the same intake, blood levels are on average lower in overweight individuals because some of the vitamin is sequestered in fat. Thus, it is weight that influences the level, and not the other way around. No data shows that supplementation causes weight loss, and no European claim supports this. This does not, however, authorize increasing the dose on one's own initiative: the question should be posed to a doctor.
Can you overdose on vitamin D?
Yes, and this is the real difference from water-soluble vitamins. Vitamin C and B vitamins are excreted in the urine if there's an excess; vitamin D, being fat-soluble, accumulates in the liver and adipose tissues. Prolonged excessive intake leads to hypercalcemia, with a risk of renal and cardiovascular calcification. Reported cases almost always involve very high doses taken for a long time, or multiple products combined without realizing it. Respect the dose on the label, add up your sources, and do not exceed 4,000 IU per day on your own initiative.
Is K2 mandatory with vitamin D?
No. D3 alone covers bone, muscle, and immune claims. K2 is a complementary approach, to be avoided with vitamin K antagonist anticoagulants without medical advice.
Should it be taken all year round?
The common reasoning is to cover the period when skin synthesis is low or non-existent, from October to March. Continuous intake is discussed depending on lifestyle, and this decision, as well as the dosage, should be made with a healthcare professional.
Where to buy Vitamin D?
In pharmacies and parapharmacies, in specialized stores, and online — the regulatory framework is the same everywhere for a food supplement; only the formula changes. One distinction is worth noting: highly dosed ampoules dispensed in pharmacies are medicines, prescribed and monitored by a doctor; they do not fall under the same regime as drops and capsules sold freely. For the latter, compare three things: the dose in µg and IU, the origin of cholecalciferol, and the price per daily dose — a bottle of drops often lasts several months. Our products are available online, shipped everywhere in France and Europe, and in-store in Vendargues, about ten minutes from Montpellier.
What brands can be found in this section?
We select formulas with clear labels: dose in micrograms and in IU, specified origin of D3. Nutriting offers A-D-K synergies in drops and capsules. IO.Genix covers the D3+K2 combination in a daily format. TrainedByJP offers a plant-based D3+K2 for those who avoid lanolin. Now Foods provides liquid formats, practical for adjusting the dose. The rest of our micronutrition products are in the probiotics and sports nutrition sections.
Need advice in a store near Montpellier?
Our store in Vendargues, about ten minutes from Montpellier, allows you to compare labels in hand: for vitamin D, everything can be read in three lines — dose per drop or capsule, origin of cholecalciferol, presence or absence of K2. We also ship everywhere in France and Europe. We will gladly tell you what a product contains and how to take it; we will not tell you if you are deficient, as that question belongs to your doctor.
Sources: ANSES for nutritional references, sun exposure, and warnings related to infants; Ciqual for food content; EFSA for opinions supporting authorized claims and the safety limit.
To learn more: why combine vitamins A, D, and K2.
Le trio calcium, magnésium, vitamine D
Le calcium ne travaille pas seul : la vitamine D est nécessaire à son absorption intestinale, et le magnésium intervient dans son métabolisme. Cette formule réunit les trois dans une même gélule.
Le calcium est nécessaire au maintien d'une ossature et d'une dentition normales. Le magnésium contribue à réduire la fatigue, au fonctionnement normal des muscles et du système nerveux, et au maintien d'une ossature normale. La vitamine D contribue à l'absorption normale du calcium et du phosphore.
Composition par dose
Autres ingrédients : hypromellose (gélule d'origine végétale), palmitate d'ascorbyle.
Végétalien — la vitamine D2 est d'origine non animale, contrairement à la D3 habituelle.
Questions fréquentes
Pourquoi de la vitamine D2 et non D3 ?
La D3 est le plus souvent d'origine animale (lanoline). La D2, issue de levure ou de champignons, permet une formule végétalienne.
Pourquoi trois formes de magnésium ?
L'oxyde est dense en magnésium, le citrate et l'aspartate sont des sels organiques mieux tolérés. Le mélange combine quantité et tolérance.
Le corail est-il prélevé en mer ?
Non, il s'agit de corail fossilisé — des dépôts calcaires issus de récifs morts depuis des millénaires.
Est-ce végétalien ?
Oui, y compris la vitamine D, qui est de la D2 d'origine non animale.
Qu'est-ce que le Calcium & Magnésium Citrate en poudre ?
C'est la seule référence en poudre du rayon calcium de Now Foods, et la plus dépouillée de toutes : une dose apporte 400 mg de calcium, 400 mg de magnésium et 200 UI de vitamine D3, et la liste des autres ingrédients est vide. Pas d'excipient, pas d'enrobage, pas de gélule : les trois nutriments et rien d'autre.
Les deux minéraux sont apportés uniquement sous forme de citrate, le sel le plus soluble — ce qui tombe bien pour une poudre destinée à être dissoute.
Et le ratio n'est pas le 2:1 habituel : ici le calcium et le magnésium sont à parts égales.
Ce que la formule apporte
- Le calcium est nécessaire au maintien d'une ossature normale et au maintien d'une dentition normale. Il contribue à une fonction musculaire normale, à une neurotransmission normale et au fonctionnement normal des enzymes digestives.
- Le magnésium contribue au maintien d'une ossature normale et d'une dentition normale, à réduire la fatigue, à un métabolisme énergétique normal, au fonctionnement normal du système nerveux, à une fonction musculaire normale, à une synthèse protéique normale, à des fonctions psychologiques normales et à l'équilibre électrolytique.
- La vitamine D contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, au maintien d'une calcémie normale et au maintien d'une ossature normale.
Avec 400 mg de magnésium par dose, c'est aussi l'apport de magnésium le plus élevé de tout le rayon calcium : 107 % de la valeur nutritionnelle de référence.
Pour qui la poudre est-elle le bon format ?
Pour qui ne veut pas avaler de comprimés. Un apport de minéraux demande du volume : les formules en comprimés du rayon tiennent en deux unités mais ce sont des comprimés volumineux, et les formules en capsules demandent deux à quatre gélules par jour. Ici, une cuillère et demie dans un verre d'eau.
C'est aussi le format qui permet de doser librement : une demi-dose, une dose et demie, selon ce que le reste de votre routine apporte déjà. Les comprimés ne le permettent pas.
Le revers : il faut le préparer, et la poudre doit être dissoute dans un liquide froid.
Questions fréquentes
Pourquoi faut-il un liquide froid ?
Parce que la poudre fait monter la température du liquide en se dissolvant. C'est une réaction normale du citrate, sans conséquence sur le produit, mais un liquide déjà chaud devient désagréable à boire.
Y a-t-il des excipients ?
Non. La liste des autres ingrédients est vide : il n'y a que le citrate de calcium, le citrate de magnésium et la vitamine D3. C'est la formule la plus dépouillée du rayon.
Pourquoi un ratio 1:1 et non 2:1 ?
C'est un choix de formule. Le 2:1 reproduit la proportion dans laquelle le corps contient ces deux minéraux ; le 1:1 met l'accent sur le magnésium, dont une dose apporte ici 107 % de la valeur nutritionnelle de référence. Si votre alimentation couvre déjà bien le calcium, ce ratio est le plus intéressant du rayon.
Quel goût a la poudre ?
Elle n'est pas aromatisée. Le citrate donne une note légèrement acidulée, que le jus de fruits couvre complètement.
Peut-on le prendre le soir ?
Oui. Le fabricant indique une prise par jour au cours d'un repas, sans préciser l'horaire ; beaucoup de personnes placent un apport de magnésium le soir. Prenez-le au moment qui s'intègre le mieux à votre journée.
Contient-il des allergènes ?
Le détail figure dans l'onglet Ingrédients. La poudre est produite dans un atelier certifié GMP qui manipule par ailleurs des ingrédients allergènes.
Où acheter ce calcium-magnésium en poudre ?
Vous pouvez le commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods.
Trois nutriments de l'immunité dans une seule gélule
C-1000 Zinc & D-3 réunit les trois nutriments les plus demandés dès que les jours raccourcissent : 1 000 mg de vitamine C, 50 µg (2 000 UI) de vitamine D3 et 15 mg de zinc. Une seule gélule par jour, et c'est fait.
Le zinc est apporté sous forme de bisglycinate Albion™ (75 mg de bisglycinate pour 15 mg de zinc élémentaire), une forme chélatée réputée douce pour l'estomac — le zinc est souvent reproché pour les nausées qu'il provoque à jeun.
Une particularité à connaître : les trois plafonds, pile
C'est le point le plus important de cette fiche, alors disons-le franchement. Cette gélule atteint exactement les trois doses journalières maximales recommandées en France :
- Vitamine C : 1 000 mg — maximum français : 1 000 mg ;
- Vitamine D : 50 µg — maximum français : 50 µg ;
- Zinc : 15 mg — maximum français : 15 mg.
Autrement dit : une gélule et vous êtes au plafond sur les trois. C'est très pratique — mais cela veut dire aussi qu'il ne faut pas y ajouter un autre complément de vitamine C, de vitamine D ou de zinc, ni un multivitamines qui en contiendrait. Et jamais deux gélules par jour. Vérifiez l'étiquette de ce que vous prenez déjà.
Ce que ces trois nutriments font, officiellement
Vitamine C
Contribue au fonctionnement normal du système immunitaire (y compris pendant et après un effort physique intense), à la formation normale de collagène (os, cartilages, peau, dents, gencives, vaisseaux sanguins), au métabolisme énergétique normal, à la réduction de la fatigue, au fonctionnement normal du système nerveux, à des fonctions psychologiques normales, à la protection des cellules contre le stress oxydatif, et augmente l'absorption du fer.
Vitamine D
Contribue au fonctionnement normal du système immunitaire, au maintien d'une ossature et d'une dentition normales, au maintien d'une fonction musculaire normale, à l'absorption et à l'utilisation normales du calcium et du phosphore, au maintien d'une calcémie normale, et joue un rôle dans le processus de division cellulaire.
Zinc
Contribue au fonctionnement normal du système immunitaire, à la synthèse normale de l'ADN et des protéines, au maintien d'une peau, de cheveux, d'ongles et d'une ossature normaux, au maintien d'une vision normale, de fonctions cognitives normales, d'un taux normal de testostérone dans le sang, à la fertilité et à la reproduction normales, au métabolisme normal des macronutriments, des glucides, des acides gras, de la vitamine A et des acides aminés, à un équilibre acido-basique normal, et à la protection des cellules contre le stress oxydatif.
Questions fréquentes
Le bisglycinate de zinc, c'est mieux ?
C'est une forme chélatée, généralement mieux tolérée à l'estomac que l'oxyde ou le sulfate.
Est-ce végane ?
Non. La gélule est végétale, mais la vitamine D3 provient de lanoline, c'est-à-dire de laine de mouton. Si vous cherchez une D3 végane, orientez-vous vers une version à base de lichen.
Je prends déjà un multivitamines, est-ce compatible ?
Probablement pas, et c'est le point à vérifier avant tout. Regardez les teneurs en vitamine C, vitamine D et zinc de votre multivitamines : si elles sont significatives, le cumul vous ferait dépasser les plafonds. Dans ce cas, choisissez l'un ou l'autre.
Disponible à Vendargues
Ce produit est aussi en rayon à la boutique Kiss Nutrition, 285 Rue des Portes Domitiennes, 34740 Vendargues. Apportez l'étiquette de ce que vous prenez déjà : on vérifiera ensemble qu'il n'y a pas de doublon.
Voir aussi nos rayons Vitamine C, Zinc, Vitamine D et la gamme complète NOW Foods.
Qu'est-ce que cette vitamine D3 400 UI ?
C'est le dosage le plus doux du rayon vitamine D de Now Foods : une petite capsule molle apporte 10 µg de vitamine D3 (400 UI), soit 200 % de la valeur nutritionnelle de référence.
La D3 est du cholécalciférol, la forme que la peau fabrique sous l'effet du soleil et celle dont l'efficacité est la mieux établie. Elle est dissoute dans de l'huile d'olive vierge extra, ce qui n'est pas un détail : la vitamine D est liposoluble et s'absorbe mal à sec.
À qui s'adresse ce dosage ?
- Quand vous cumulez déjà des apports. Un multivitamines, un oméga 3 vitaminé ou un complexe calcium-vitamine D en contiennent déjà. Ce dosage permet de compléter sans dépasser.
- Quand vous voulez régler finement. Deux capsules font 20 µg, ce que le fabricant autorise. C'est le seul dosage de la gamme qui permet ce réglage par paliers de 10 µg.
- Quand votre médecin vous a donné une cible basse. Certaines situations médicales l'imposent ; dans ce cas c'est son avis qui compte, pas le nôtre.
Si vous cherchez simplement à couvrir l'hiver sans rien d'autre, notre vitamine D3 1000 UI est le dosage le plus adapté.
Ce que la vitamine D apporte
- Elle contribue au fonctionnement normal du système immunitaire.
- Elle contribue au maintien d'une ossature normale et d'une dentition normale.
- Elle contribue au maintien d'une fonction musculaire normale.
- Elle contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, et au maintien d'une concentration normale de calcium dans le sang.
- Elle joue un rôle dans le processus de division cellulaire.
C'est le seul nutriment pour lequel l'alimentation ne peut pratiquement rien : l'essentiel vient de l'exposition de la peau au soleil. De novembre à mars, le rayonnement est trop faible à nos latitudes pour permettre cette synthèse.
Questions fréquentes
400 UI, n'est-ce pas trop peu ?
C'est un dosage modeste, et nous le disons. Il est pertinent quand vous cumulez déjà d'autres apports de vitamine D, ou quand vous voulez régler votre dose par paliers de 10 µg. Pour couvrir l'hiver sans rien d'autre, prenez plutôt le 1000 UI.
Est-ce vegan ou végétarien ?
Non, ni l'un ni l'autre : la D3 est extraite de la lanoline, une graisse de laine de mouton, et l'enveloppe de la capsule est en gélatine bovine.
Peut-on la donner à un enfant ?
Ce produit est réservé à l'adulte par le fabricant. Chez l'enfant, la vitamine D relève d'une prescription médicale : parlez-en à votre médecin ou à votre pharmacien.
Où acheter cette vitamine D3 400 UI ?
Vous pouvez la commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods, et tous nos dosages dans le rayon vitamine D.
Ce que ces deux vitamines apportent
La vitamine D3 — 25 µg :
- Elle contribue au maintien d'une ossature normale et d'une dentition normale.
- Elle contribue au fonctionnement normal du système immunitaire.
- Elle contribue au maintien d'une fonction musculaire normale.
- Elle contribue à l'absorption et à l'utilisation normales du calcium et du phosphore.
- Elle joue un rôle dans le processus de division cellulaire.
La vitamine K2 — 45 µg :
- Elle contribue au maintien d'une ossature normale.
- Elle contribue à une coagulation sanguine normale.
MK-4 : ce que dit l'étiquette
Autant être précis, parce que c'est une vraie différence. La vitamine K2 existe sous plusieurs formes ; les deux utilisées en complément sont la MK-4 et la MK-7. Cette référence contient de la MK-4.
Questions fréquentes
Est-ce vegan ou végétarien ?
Végétarien oui, vegan non : la gélule et les excipients sont végétaux, mais la vitamine D3 de la gamme est extraite de lanoline, une graisse de laine de mouton.
Où acheter cette vitamine D3 et K2 ?
Vous pouvez la commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods, et tous nos dosages dans le rayon vitamine D.
Qu'est-ce que cette vitamine A et D ?
C'est l'association classique des deux vitamines liposolubles de Now Foods : une capsule molle apporte 3 000 µg de vitamine A (10 000 UI) sous forme de palmitate de rétinyle et 10 µg de vitamine D3 (400 UI), dissoutes dans de l'huile d'olive vierge extra biologique.
Ce que ces deux vitamines apportent
La vitamine A :
- Elle contribue au maintien d'une vision normale.
- Elle contribue au maintien d'une peau normale et de muqueuses normales.
- Elle contribue au fonctionnement normal du système immunitaire.
- Elle contribue à un métabolisme normal du fer.
- Elle joue un rôle dans le processus de spécialisation cellulaire.
La vitamine D :
- Elle contribue au maintien d'une ossature normale et d'une dentition normale.
- Elle contribue au fonctionnement normal du système immunitaire et au maintien d'une fonction musculaire normale.
- Elle contribue à l'absorption et à l'utilisation normales du calcium et du phosphore.
Ces effets sont tous obtenus très en dessous de 3 000 µg de vitamine A : ce n'est pas un dosage qui les renforce, c'est un dosage de correction d'un déficit.
Palmitate de rétinyle : ce que dit l'étiquette
La vitamine A de cette référence est du palmitate de rétinyle, c'est-à-dire du rétinol préformé — la forme animale, directement active. C'est important à comprendre, parce que c'est elle qui porte le risque de surdosage.
Le bêta-carotène, la provitamine A des végétaux, est tout autre chose : l'organisme n'en convertit que ce dont il a besoin, et il ne présente pas ce risque. Les précautions de cette fiche ne s'appliquent qu'au rétinol préformé.
Questions fréquentes
Quelle différence avec le bêta-carotène ?
Le bêta-carotène est la provitamine A des végétaux : l'organisme n'en convertit que ce dont il a besoin, et il ne présente pas de risque de surdosage. Cette référence contient du rétinol préformé, directement actif — c'est lui qui impose toutes les précautions de cette fiche.
Peut-on la cumuler avec un multivitamines ?
Non, pas sans faire le total et en parler à votre médecin. La plupart des multivitamines contiennent déjà de la vitamine A.
Est-ce vegan ou végétarien ?
Non, ni l'un ni l'autre : la vitamine D3 est extraite de la lanoline, une graisse de laine de mouton, et l'enveloppe de la capsule est en gélatine bovine.
Je cherche surtout de la vitamine D, est-ce le bon produit ?
Non. Ses 10 µg de vitamine D sont modestes, et vous prendriez les 3 000 µg de vitamine A pour rien. Prenez une vitamine D seule dans notre rayon.
Où acheter cette vitamine A et D ?
Vous pouvez la commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods, et nos dosages de vitamine D dans le rayon vitamine D.
Qu'est-ce que le Cal-Mag DK de Now Foods ?
C'est la formule d'ossature la plus fractionnée de la gamme Now Foods : quatre capsules réparties en deux prises, plutôt que tout en une fois. Les lettres D et K du nom désignent les deux vitamines associées au calcium, la vitamine D3 et la vitamine K2 MenaQ7®.
Son calcium est apporté uniquement sous forme de citrate, le sel de calcium le plus soluble du rayon : c'est le choix le plus simple à digérer, et il ne dépend pas de l'acidité de l'estomac pour être absorbé. Le magnésium, lui, est apporté sous forme d'oxyde.
La capsule est en hypromellose, une cellulose d'origine végétale.
Ce que la formule apporte
- Le calcium est nécessaire au maintien d'une ossature normale et au maintien d'une dentition normale. Il contribue à une fonction musculaire normale, à une neurotransmission normale et au fonctionnement normal des enzymes digestives.
- Le magnésium contribue au maintien d'une ossature normale et d'une dentition normale, à réduire la fatigue, à un métabolisme énergétique normal, au fonctionnement normal du système nerveux, à une fonction musculaire normale, à une synthèse protéique normale, à des fonctions psychologiques normales et à l'équilibre électrolytique.
- La vitamine D contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, au maintien d'une calcémie normale et au maintien d'une ossature normale.
- La vitamine K contribue au maintien d'une ossature normale et à une coagulation sanguine normale.
Pourquoi le citrate de calcium seul ?
Parce que c'est la forme de calcium la plus soluble des sels courants. Un carbonate est plus concentré en calcium élémentaire — il permet de tenir un gros dosage sur peu de comprimés — mais il a besoin d'un milieu acide pour se dissoudre, donc d'être pris au repas. Le citrate s'absorbe indépendamment de l'acidité gastrique et pèse moins sur la digestion.
Le prix de ce choix est le volume : 266 mg de calcium pour deux capsules, là où un carbonate en met deux fois plus. D'où les quatre capsules par jour.
Qu'est-ce que le MenaQ7® ?
C'est un ingrédient breveté de vitamine K2 sous forme MK-7 (ménaquinone-7), obtenu par fermentation. La MK-7 est la forme de vitamine K2 dont la durée de présence dans l'organisme est la plus longue, ce qui permet une prise quotidienne unique plutôt que répétée.
Comme le calcium et le magnésium, la vitamine K contribue au maintien d'une ossature normale : c'est ce qui justifie sa place dans une formule d'ossature.
Questions fréquentes
Pourquoi quatre capsules alors que d'autres formules n'en demandent que deux ?
Parce que le calcium est ici du citrate, une forme plus soluble mais moins concentrée en calcium élémentaire qu'un carbonate. Il faut donc plus de volume pour la même quantité de calcium. Le fractionnement en deux prises est par ailleurs favorable à l'absorption.
Quelle différence avec le Cal-Mag Caps ?
Le Cal-Mag Caps est plus complet — il ajoute le zinc, le cuivre, le manganèse et le kelp — et plus dosé par prise : 500 mg de calcium en deux capsules, contre 266 mg ici. Le Cal-Mag DK mise à l'inverse sur une seule forme de calcium, le citrate, et sur le fractionnement.
Qu'est-ce que le MenaQ7® ?
Un ingrédient breveté de vitamine K2 sous forme MK-7, obtenu par fermentation. C'est la forme de vitamine K2 qui reste le plus longtemps disponible dans l'organisme.
Le magnésium sous forme d'oxyde est-il un bon choix ?
L'oxyde est le sel de magnésium le plus concentré mais le moins soluble : chez les personnes sensibles, il peut accélérer le transit. Le dosage reste ici modéré, 133 mg par prise, et le fractionnement en deux prises limite ce phénomène. Si vous recherchez un magnésium très bien toléré, regardez les bisglycinates de notre rayon magnésium.
Contient-il des allergènes ?
Le détail figure dans l'onglet Ingrédients. Les capsules sont produites dans un atelier certifié GMP qui manipule par ailleurs des ingrédients allergènes.
Où acheter ce calcium-magnésium à la vitamine K2 ?
Vous pouvez le commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods.
Qu'est-ce que cette vitamine D2 vegan ?
C'est la seule vitamine D vegan de notre rayon vitamine D, et c'est sa raison d'être. Une gélule végétale apporte 25 µg de vitamine D2 (1 000 UI), soit 500 % de la valeur nutritionnelle de référence.
La D2 est de l'ergocalciférol, d'origine végétale. Toutes les autres vitamines D de la gamme Now Foods sont de la D3 extraite de lanoline, une graisse de laine de mouton, dans une capsule de gélatine bovine — donc ni vegan, ni végétarienne.
Ici, tout est végétal : l'actif, la gélule en hypromellose (cellulose) et les excipients. C'est une formule sèche, sans huile.
D2 ou D3 : la réponse honnête
En revanche, et il faut le dire : la D3 est la forme la mieux documentée pour élever et maintenir durablement le taux sanguin de vitamine D. La D2 y parvient aussi, mais la littérature lui attribue généralement une efficacité moindre à dose égale. Ce n'est pas un argument pour la disqualifier — c'est un arbitrage à connaître.
Ce que la vitamine D apporte
- Elle contribue au fonctionnement normal du système immunitaire.
- Elle contribue au maintien d'une ossature normale et d'une dentition normale.
- Elle contribue au maintien d'une fonction musculaire normale.
- Elle contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, et au maintien d'une concentration normale de calcium dans le sang.
- Elle joue un rôle dans le processus de division cellulaire.
C'est le seul nutriment pour lequel l'alimentation ne peut pratiquement rien : l'essentiel vient de l'exposition de la peau au soleil. De novembre à mars, le rayonnement est trop faible à nos latitudes. La question se pose avec d'autant plus d'acuité dans une alimentation végétale, où les rares sources alimentaires de vitamine D — poissons gras, jaune d'œuf, foie — sont absentes.
Questions fréquentes
Est-ce vraiment vegan ?
Oui : la D2 est d'origine végétale, la gélule est en hypromellose (cellulose) et l'acide stéarique de la formule est d'origine végétale. Aucun ingrédient animal, contrairement à toutes les D3 de la gamme.
Pourquoi « dry » sur l'étiquette ?
Parce que la formule est sèche, sans huile, contrairement aux capsules molles de D3 de la gamme. C'est ce qui permet une gélule entièrement végétale — et c'est pourquoi il faut la prendre au cours d'un repas contenant un peu de matière grasse.
Où acheter cette vitamine D vegan ?
Vous pouvez la commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods, et tous nos dosages dans le rayon vitamine D.
Qu'est-ce que cette vitamine D3 à croquer ?
C'est le même dosage que notre vitamine D3 5000 UI en capsules, mais dans un comprimé à croquer à la menthe : 125 µg de vitamine D3 (5 000 UI), soit 2 500 % de la valeur nutritionnelle de référence. Rien à avaler, et le comprimé est sans sucres — le goût vient du xylitol et du sorbitol.
À qui s'adresse le format à croquer ?
- À qui ne veut pas avaler de capsule, pour une raison mécanique ou simplement par réflexe.
- À qui écarte la gélatine bovine : le comprimé n'en contient pas, contrairement aux capsules molles de la gamme. L'actif reste d'origine animale.
- Au voyage : rien à avaler avec de l'eau.
Sans sucres : ce que cela implique
Le goût vient de polyols — xylitol et sorbitol — et non de sucre. Deux choses à savoir :
- Une consommation excessive de polyols peut avoir des effets laxatifs. À un comprimé tous les deux jours, le risque est négligeable.
- Le xylitol est toxique pour les chiens, même en très petite quantité. Si vous avez un chien, rangez le flacon hors de sa portée.
Ce que la vitamine D apporte
- Elle contribue au fonctionnement normal du système immunitaire.
- Elle contribue au maintien d'une ossature normale et d'une dentition normale.
- Elle contribue au maintien d'une fonction musculaire normale.
- Elle contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, et au maintien d'une concentration normale de calcium dans le sang.
- Elle joue un rôle dans le processus de division cellulaire.
Ces effets sont obtenus bien en dessous de 125 µg : un apport plus élevé ne les renforce pas.
Questions fréquentes
Le format à croquer est-il moins dosé ?
Non, exactement le même : 125 µg. Seule la forme change.
Quel goût a-t-il ?
Menthe, avec d'autres arômes naturels. Il est sans sucres : le goût vient du xylitol et du sorbitol.
Y a-t-il un inconvénient aux polyols ?
Une consommation excessive de polyols peut avoir des effets laxatifs. À un comprimé tous les deux jours le risque est négligeable. Attention en revanche si vous avez un chien : le xylitol est toxique pour les chiens, même en petite quantité.
Est-ce vegan ou végétarien ?
Végétarien oui, vegan non : le comprimé est entièrement végétal, mais la vitamine D3 est extraite de la lanoline, une graisse de laine de mouton.
Faut-il le prendre avec un repas ?
Oui, impérativement, et avec un repas contenant des matières grasses. Le comprimé est sec et n'apporte aucun lipide pour véhiculer la vitamine D.
Où acheter cette vitamine D3 à croquer ?
Vous pouvez la commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods, et tous nos dosages dans le rayon vitamine D.
Qu'est-ce que le Citrate de Calcium de Now Foods ?
Le Citrate de Calcium de Now Foods n'est pas un calcium seul : c'est un complexe osseux à six nutriments. Deux comprimés apportent 600 mg de calcium sous forme de citrate, 300 mg de magnésium, 15 mg de zinc, 1 mg de cuivre, 5 mg de manganèse et 10 µg de vitamine D.
Le citrate est une forme de calcium qui se dissout sans avoir besoin de l'acidité de l'estomac, là où le carbonate demande un milieu acide pour être assimilé. Le zinc, le cuivre et le manganèse sont apportés en bisglycinates chélatés Albion®, une matière première nommée sur l'étiquette.
La vitamine D est de la vitamine D2, d'origine végétale : c'est ce qui rend la formule entièrement vegan, quand la plupart des compléments de calcium utilisent une vitamine D3 issue de la lanoline.
Ce que la formule apporte
Les six nutriments atteignent tous des dosages qui permettent de parler de leurs effets reconnus :
- Le calcium est nécessaire au maintien d'une ossature normale et au maintien d'une dentition normale. Il contribue à une fonction musculaire normale et à une neurotransmission normale.
- La vitamine D contribue à l'absorption et à l'utilisation normales du calcium et du phosphore, au maintien d'une ossature normale et au fonctionnement normal du système immunitaire.
- Le magnésium contribue au maintien d'une ossature normale, à réduire la fatigue, à un métabolisme énergétique normal et au fonctionnement normal du système nerveux.
- Le zinc contribue au maintien d'une ossature normale et à la protection des cellules contre le stress oxydatif.
- Le cuivre contribue au maintien de tissus conjonctifs normaux et à la protection des cellules contre le stress oxydatif.
- Le manganèse contribue à la formation normale de tissus conjonctifs et au maintien d'une ossature normale.
Pourquoi six nutriments plutôt que du calcium seul ?
Parce que l'os n'est pas fait que de calcium. Le magnésium et le zinc entrent dans sa trame minérale, le cuivre et le manganèse dans la formation du collagène qui lui sert d'armature, et la vitamine D commande l'absorption du calcium lui-même.
Questions fréquentes
Quelle différence entre le citrate et le carbonate de calcium ?
Le citrate se dissout sans avoir besoin de l'acidité de l'estomac, ce qui le rend simple à prendre à n'importe quel moment de la journée. Le carbonate, lui, demande un milieu acide pour être assimilé et se prend donc au cours d'un repas.
La formule est-elle vegan ?
Oui. La vitamine D utilisée est de la vitamine D2 d'origine végétale et l'enrobage du comprimé est à base de cellulose. Le fabricant classe la formule vegan.
Que sont les minéraux Albion® ?
Ce sont des bisglycinates chélatés : le minéral est lié à deux molécules de glycine. Le zinc, le cuivre et le manganèse de cette formule sont sous cette forme, nommée sur l'étiquette.
Quels sont les apports par prise ?
Deux comprimés apportent 600 mg de calcium, 300 mg de magnésium, 15 mg de zinc, 1 mg de cuivre, 5 mg de manganèse et 10 µg de vitamine D. Le détail complet figure dans l'onglet Valeurs nutritionnelles.
Contient-il des allergènes ?
Le détail figure dans l'onglet Ingrédients. Les comprimés sont produits dans un atelier certifié GMP qui manipule par ailleurs des ingrédients allergènes.
Où acheter ce citrate de calcium ?
Vous pouvez le commander sur cette page, et nous expédions partout en France et en Europe. Cette référence est tenue en stock à l'entrepôt et n'est pas présentée en rayon à Vendargues : si vous souhaitez la voir en boutique, dites-le-nous à l'avance et nous la faisons venir.
La gamme complète de la marque est sur notre page Now Foods.
Retrait au magasin sous 2 h
À Vendargues, près de Montpellier. Vous êtes prévenu dès que la commande est prête.
Commandé avant 14 h, expédié le jour même
Du lundi au samedi. Le délai d'acheminement appartient ensuite au transporteur.
Livraison offerte dès 69 €
En France métropolitaine, et dès 100 € en Europe. Modes et délais.
Une question avant de commander ?
Écrivez-nous ou passez au magasin : on connaît les produits qu'on vend.
What is the purpose of vitamin D in the body?
Vitamin D isn't really a vitamin; it's a prohormone. Ingested or synthesized by the skin, it becomes 25-hydroxyvitamin D in the liver—the storage form measured in the blood—and then calcitriol in the kidneys, which is the active form. Calcitriol acts on receptors throughout the body and, notably, controls intestinal calcium absorption. Seven health claims are authorized at the European level, with regulated wording:
- "Vitamin D contributes to the normal absorption and utilization of calcium and phosphorus."
- "Vitamin D contributes to normal blood calcium levels."
- "Vitamin D contributes to the maintenance of normal bones."
- "Vitamin D contributes to the maintenance of normal muscle function."
- "Vitamin D contributes to the maintenance of normal teeth."
- "Vitamin D contributes to the normal function of the immune system."
- "Vitamin D plays a role in the process of cell division."
These claims can only be used if the product is at least a "source of vitamin D," meaning 15% of the nutrient reference value: since the NRV is 5 µg, this means 0.75 µg per serving. Note what they do not say: they speak of maintenance and normal function, never of treating illnesses.
Why isn't the sun enough from October to March?
The skin produces vitamin D3 from a cholesterol precursor, 7-dehydrocholesterol, under the effect of UVB rays—the fraction of solar radiation between 290 and 315 nanometers, which is most easily blocked by the atmosphere. This is where latitude comes in. Metropolitan France extends from approximately 41° to 51° north: in winter, the sun never rises high above the horizon there, its rays pass through a much greater thickness of atmosphere than in summer, and the ozone layer absorbs most of the UVB before it reaches the ground. From October to March, cutaneous synthesis thus becomes marginal in Lille as in Lyon, a little less early and for a shorter time in Montpellier. It's not a matter of temperature: a bright and freezing winter day doesn't produce more vitamin D than a gray day.
Three additional factors play a role all year round: glass blocks UVB, melanin filters radiation in darker skin, and synthesis capacity decreases with age.
ANSES recommends exposing arms and face for 15 to 20 minutes in the late morning or afternoon during the warmer months, without negating skin cancer prevention guidelines. In terms of diet, intake remains low—fatty fish, cod liver oil, egg yolk, fortified dairy products—and ANSES estimates the average intake for adults in France at around 3.1 µg per day. It is this deficiency that raises the question of winter supplementation.
Vitamin D2 or D3, and where does D3 come from?
Vitamin D2 (ergocalciferol) comes from yeasts or fungi exposed to UV. Vitamin D3 (cholecalciferol) is the form the body produces itself: at the same dose, it raises and maintains blood levels of 25-hydroxyvitamin D more effectively than D2, which has made it the standard in supplements.
Its origin remains. Classic D3 is extracted from lanolin, the wool grease from sheep shorn: the animal is not slaughtered, but the product is not vegan for all that. The alternative is D3 from lichen (Cladonia rangiferina), chemically identical but of plant origin; relevant labels specify this, often with the mention "vegan." In its absence, it is almost always lanolin. As the extraction yield from lichen is lower, these versions cost more.
What are the official intake benchmarks in France?
The nutritional reference for the population established by ANSES is 15 µg per day for adults, or 600 IU. The conversion to remember when reading a label: 1 µg = 40 IU. A dosage of 1,000 IU is therefore 25 µg, 2,000 IU is 50 µg.
Regarding the upper limit, the safe upper limit adopted at the European level is 100 µg per day (4,000 IU) for adults, from all sources combined: including food, supplements, and medications. It is lower for children, and much lower for infants. This is not a target but a threshold not to be crossed without medical supervision.
Two additional claims come with specific conditions. For seniors: "Vitamin D helps reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures in men and women aged 60 and over" — starting from 20 µg per day, for this age group only. For children: "Vitamin D is necessary for normal bone growth and development in children." This last one does not concern us: ANSES recommends using prescribed medications for infants and young children. This section is for adults.
Why is vitamin D combined with K2 and magnesium?
Vitamin K2 (menaquinone, most often MK-7) activates vitamin K-dependent proteins, including osteocalcin, involved in bone mineralization. The accepted claim is "Vitamin K contributes to the maintenance of normal bones," usable from 11.25 µg per serving. The widespread idea that K2 "directs" calcium towards bones rather than arteries remains a research hypothesis. One safety point, however, is established: vitamin K interferes with vitamin K antagonist anticoagulants. Anyone concerned should avoid D3+K2 formulas and discuss it with their doctor.
Magnesium acts as a cofactor for the enzymes that hydroxylate vitamin D in the liver and kidneys—this is biochemistry, not a promise of effect. The authorized claims for it are "Magnesium contributes to the maintenance of normal bones" and "Magnesium contributes to normal muscle function," from 56.25 mg per serving. As intake is often just right in France, the magnesium section has its place here, as do ZMA formulas that combine it with zinc. Nothing is mandatory: D3 alone remains consistent. If you combine, do the math—many multivitamins already contain it.
Oily drops or tablets: which to choose?
Vitamin D is fat-soluble: regardless of the form, take it with a meal containing fats. On an empty stomach or with a fat-free breakfast, absorption is less effective.
Oily drops and sprays deliver the vitamin already dissolved in a fatty substance—olive oil, coconut oil, medium-chain triglycerides. This is the most flexible form for dosing and the simplest for those who have difficulty swallowing capsules; the bottle should be stored away from light. Dry tablets and capsules are easier to transport and offer perfectly reproducible dosing, with good absorption if taken with a proper meal. Daily intake is easier to maintain than a large weekly dose. Highly dosed ampoules sold in pharmacies are prescription medicines: they do not fall under this category.
What risks should be known before supplementing?
The risk of overdose is real, precisely because vitamin D is fat-soluble. Unlike vitamin C or B vitamins, whose excess is excreted in the urine, it accumulates in fatty tissues and the liver. Prolonged excessive intake leads to hypercalcemia, with a risk of calcification of kidney and cardiovascular tissues. The rule: respect the dose on the label, do not stack sources, and never exceed 4,000 IU per day on your own initiative.
Medical advice is essential before any supplementation in case of pregnancy or breastfeeding; for infants, children, and adolescents; in case of kidney failure, kidney stones, known hypercalcemia, sarcoidosis, or another granulomatous disease; when taking vitamin K antagonist anticoagulants, especially with a formula containing K2; when taking thiazide diuretics, corticosteroids, or digitalis; and for individuals being treated for a bone pathology.
Finally, the most important point on this page: anything related to deficiency is a matter for a doctor. Deciding on a blood test, interpreting it, choosing a corrective dose, and monitoring it are medical acts. A supplement is not a diagnostic tool.
Is vitamin D of interest to athletes?
What we know: vitamin D status is, on average, lower in athletes who train indoors—strength training, gymnastics, combat sports, indoor swimming—and it decreases in almost everyone in winter. The claims "normal muscle function" and "normal bones" are not insignificant in high-impact activities.
What we don't know: there is no evidence to suggest that additional intake improves strength, endurance, or recovery in an athlete whose status is already adequate. Studies on performance are heterogeneous, and the effect, when it appears, concerns individuals who started from very low levels. Vitamin D is part of the nutritional foundation, alongside omega-3s, not a performance arsenal. It does not replace glucosamine or collagen, and for muscle mass, training and proteins do the work—our sports nutrition guide positions each product.
Frequently Asked Questions
What vitamin does the sun provide?
Vitamin D, and only vitamin D. Under the effect of UVB rays, the skin converts a cholesterol precursor into vitamin D3—exactly the same molecule as in supplements. This is the only vitamin the body produces this way, which explains its special status: neither quite a vitamin, nor quite a hormone. Three useful clarifications. It's UVB that counts, not heat or brightness: a bright winter day produces almost none. Glass blocks them: behind a window or windshield, synthesis is nil. And in our latitudes, it becomes marginal from October to March, no matter the weather.
What is the role of vitamin D?
Its central role is to control the intestinal absorption of calcium and phosphorus, and thus the mineralization of bones and teeth. However, its receptors are present in almost all tissues, which explains the seven authorized European claims: normal absorption of calcium and phosphorus, normal blood calcium levels, maintenance of normal bones, teeth, and muscle function, normal immune system function, and a role in cell division. Technically, it is not a vitamin but a prohormone: transformed in the liver and then in the kidneys, it then acts as a hormone throughout the body.
What is the daily dose of vitamin D for adults?
The ANSES nutritional reference for adults is 15 µg per day, or 600 IU. Remember the conversion, it allows you to read any label: 1 µg is 40 IU, so 1,000 IU is 25 µg and 2,000 IU is 50 µg. The European upper safety limit is set at 100 µg per day, or 4,000 IU, from all sources combined—including food, supplements, and medications. This is not a target, but a ceiling not to be exceeded without supervision. A dose intended to correct a low level should be decided with a doctor and not from a product sheet.
What time of day should vitamin D be taken?
The time of day matters little, the meal matters a lot. Vitamin D is fat-soluble: its absorption depends on the lipids present in the stomach at the same time. Take it with lunch or dinner, as long as the meal contains fats; on an empty stomach or with a fat-free breakfast, part of the dose is lost. Morning or evening makes no proven difference, contrary to what is sometimes read. A regular daily intake is easier to maintain over time than a large weekly dose, and it is regularity that counts over several months.
How to get vitamin D?
Through three channels, only one of which is truly effective in winter. First, the sun: exposing arms and face for 15 to 20 minutes in the late morning or afternoon during the warmer months is enough to cover a good part of the needs—but synthesis becomes marginal from October to March in our latitudes, and sun protection guidelines remain valid. Next, diet: fatty fish twice a week, egg yolk, liver, fortified products. This is the most neglected channel, but also the most limited—ANSES estimates the average dietary intake for adults in France at about 3.1 µg per day, far from the reference 15 µg. Finally, supplementation, which makes sense during the autumn-winter period. None of these three levers precludes medical advice if you suspect a real deficiency.
What foods contain vitamin D?
A short list, and that's the problem. At the top, cod liver oil, far above everything else. Then come fatty fish—herring, mackerel, sardine, salmon, anchovies—then liver, egg yolk, some cheeses, and fortified dairy products. Mushrooms exposed to ultraviolet light provide vitamin D2, which is less effective than D3 in raising blood levels. That's all: no other food family contains it in useful quantities. Two servings of fatty fish per week are the most effective dietary lever. Exact contents can be checked on the ANSES Ciqual table.
What fruit or vegetable contains vitamin D?
None, and that's the honest answer to a frequently asked question. Neither fruits nor vegetables provide vitamin D in useful quantities: the molecule is of animal or fungal origin. The only plant exception: mushrooms exposed to ultraviolet light, which produce vitamin D2. A vegan diet therefore particularly exposes one to deficiency, and supplementation becomes a full-fledged topic—with lichen-derived D3 if you exclude lanolin.
What is the best vitamin D?
D3 (cholecalciferol) rather than D2: at the same dose, it raises and maintains blood levels better. Beyond this choice, three label lines differentiate two products. The dose displayed in micrograms AND IU, without which comparison is impossible. The origin of D3: lanolin in the vast majority of cases, lichen for plant-based versions—chemically identical, more expensive. Finally, the galenic form: oily drops allow for fine dose adjustment, while capsules are easier to transport. A very high-dose product is not "better": beyond 4,000 IU per day, it falls outside the scope of self-medication.
How to fix vitamin D, and can it be combined with magnesium?
Two concrete levers. The first is a fatty meal: without lipids, absorption drops, regardless of product quality. The second is magnesium, a cofactor for enzymes that transform vitamin D in the liver and then in the kidneys. Taking them together poses no problem, and there's no need to space them out. Beyond that, no problematic interaction is documented at usual doses with common micronutrients; the only precaution is accounting—add up the vitamin D intake from all your products. Our iron and vitamin E sections complete the range.
What are the signs of vitamin D deficiency?
This is the most frequently asked question on the subject, and one we will not answer with a list. The signs mentioned everywhere—fatigue, widespread pain, low mood, muscle weakness—are too common and shared with other conditions to allow anyone to conclude. Only a doctor, with a 25-hydroxyvitamin D blood test if deemed useful, can answer. Interpreting the result, choosing a corrective dose, and monitoring it are medical acts. A food supplement ensures adequate intake for a healthy person; it diagnoses nothing and never replaces a prescription.
Does a lack of vitamin D cause weight gain?
The link exists in the data, but not in the way one might imagine. Vitamin D is stored in adipose tissue: for the same intake, blood levels are on average lower in overweight individuals because some of the vitamin is sequestered in fat. Thus, it is weight that influences the level, and not the other way around. No data shows that supplementation causes weight loss, and no European claim supports this. This does not, however, authorize increasing the dose on one's own initiative: the question should be posed to a doctor.
Can you overdose on vitamin D?
Yes, and this is the real difference from water-soluble vitamins. Vitamin C and B vitamins are excreted in the urine if there's an excess; vitamin D, being fat-soluble, accumulates in the liver and adipose tissues. Prolonged excessive intake leads to hypercalcemia, with a risk of renal and cardiovascular calcification. Reported cases almost always involve very high doses taken for a long time, or multiple products combined without realizing it. Respect the dose on the label, add up your sources, and do not exceed 4,000 IU per day on your own initiative.
Is K2 mandatory with vitamin D?
No. D3 alone covers bone, muscle, and immune claims. K2 is a complementary approach, to be avoided with vitamin K antagonist anticoagulants without medical advice.
Should it be taken all year round?
The common reasoning is to cover the period when skin synthesis is low or non-existent, from October to March. Continuous intake is discussed depending on lifestyle, and this decision, as well as the dosage, should be made with a healthcare professional.
Where to buy Vitamin D?
In pharmacies and parapharmacies, in specialized stores, and online — the regulatory framework is the same everywhere for a food supplement; only the formula changes. One distinction is worth noting: highly dosed ampoules dispensed in pharmacies are medicines, prescribed and monitored by a doctor; they do not fall under the same regime as drops and capsules sold freely. For the latter, compare three things: the dose in µg and IU, the origin of cholecalciferol, and the price per daily dose — a bottle of drops often lasts several months. Our products are available online, shipped everywhere in France and Europe, and in-store in Vendargues, about ten minutes from Montpellier.
What brands can be found in this section?
We select formulas with clear labels: dose in micrograms and in IU, specified origin of D3. Nutriting offers A-D-K synergies in drops and capsules. IO.Genix covers the D3+K2 combination in a daily format. TrainedByJP offers a plant-based D3+K2 for those who avoid lanolin. Now Foods provides liquid formats, practical for adjusting the dose. The rest of our micronutrition products are in the probiotics and sports nutrition sections.
Need advice in a store near Montpellier?
Our store in Vendargues, about ten minutes from Montpellier, allows you to compare labels in hand: for vitamin D, everything can be read in three lines — dose per drop or capsule, origin of cholecalciferol, presence or absence of K2. We also ship everywhere in France and Europe. We will gladly tell you what a product contains and how to take it; we will not tell you if you are deficient, as that question belongs to your doctor.
Sources: ANSES for nutritional references, sun exposure, and warnings related to infants; Ciqual for food content; EFSA for opinions supporting authorized claims and the safety limit.
To learn more: why combine vitamins A, D, and K2.
Sources
- ANSES — Les compléments alimentaires
- Règlement UE n° 432/2012 — allégations de santé autorisées
- Règlement CE n° 1924/2006 — allégations nutritionnelles et de santé
À intégrer dans une alimentation variée et équilibrée et un mode de vie sain.
Questions fréquentes — Vitamin D
Quelle vitamine apporte le soleil ?
La vitamine D, et elle seule. Sous l'effet des UVB, la peau transforme un précurseur du cholestérol en vitamine D3 — exactement la même molécule que celle des compléments. C'est la seule vitamine que l'organisme fabrique de cette façon, ce qui explique son statut particulier : ni tout à fait vitamine, ni tout à fait hormone. Trois précisions utiles. Ce sont les UVB qui comptent, pas la chaleur ni la luminosité : une journée d'hiver éclatante n'en produit pratiquement pas. Le verre les bloque : derrière une fenêtre ou un pare-brise, la synthèse est nulle. Et sous nos latitudes, elle devient marginale d'octobre à mars, quel que soit le temps qu'il fait.
Quel est le rôle de la vitamine D ?
Son rôle central est de commander l'absorption intestinale du calcium et du phosphore, donc la minéralisation de l'os et de la dent. Mais ses récepteurs sont présents dans presque tous les tissus, ce qui explique les sept allégations européennes autorisées : absorption normale du calcium et du phosphore, taux normaux de calcium sanguin, maintien d'une ossature, d'une dentition et d'une fonction musculaire normales, fonctionnement normal du système immunitaire, rôle dans la division cellulaire. Techniquement, ce n'est pas une vitamine mais une prohormone : transformée dans le foie puis dans le rein, elle agit ensuite comme une hormone dans tout l'organisme.
Quelle dose de vitamine D par jour chez l'adulte ?
La référence nutritionnelle de l'ANSES est de 15 µg par jour chez l'adulte, soit 600 UI. Retenez la conversion, elle permet de lire n'importe quelle étiquette : 1 µg vaut 40 UI, donc 1 000 UI valent 25 µg et 2 000 UI 50 µg. La limite supérieure de sécurité européenne est fixée à 100 µg par jour, soit 4 000 UI, toutes sources confondues — alimentation, compléments et médicaments compris. C'est un plafond à ne pas franchir sans encadrement médical. Une dose destinée à corriger un taux bas se décide avec votre médecin.
À quel moment de la journée prendre la vitamine D ?
Le moment importe peu, le repas beaucoup. La vitamine D est liposoluble : son absorption dépend des lipides présents dans l'estomac au même moment. Prenez-la au déjeuner ou au dîner, dès lors que le repas contient des matières grasses ; à jeun ou sur un petit-déjeuner sans corps gras, une partie de la dose est perdue. Matin ou soir, rien ne distingue les deux. Une prise quotidienne régulière se tient plus facilement dans la durée qu'une grosse dose hebdomadaire, et c'est la régularité qui compte sur plusieurs mois.
Comment faire pour avoir de la vitamine D ?
Par trois voies. Le soleil d'abord : bras et visage exposés 15 à 20 minutes en fin de matinée ou l'après-midi à la belle saison couvrent une bonne partie des besoins, la synthèse devenant marginale d'octobre à mars sous nos latitudes, et les consignes de prévention solaire restent valables. L'alimentation ensuite : poissons gras deux fois par semaine, jaune d'œuf, foie, produits enrichis — l'ANSES estime l'apport alimentaire moyen des adultes en France à environ 3,1 µg par jour, pour une référence de 15 µg. La supplémentation enfin, qui prend tout son sens sur la période automne-hiver. Si vous soupçonnez un vrai manque, l'avis de votre médecin reste la référence.
Quels aliments contiennent de la vitamine D ?
En tête, l'huile de foie de morue, très au-dessus de tout le reste. Viennent ensuite les poissons gras — hareng, maquereau, sardine, saumon, anchois — puis le foie, le jaune d'œuf, quelques fromages et les produits laitiers enrichis. Les champignons exposés aux ultraviolets apportent de la vitamine D2. Deux portions de poisson gras par semaine constituent le levier alimentaire le plus efficace. Les teneurs exactes se vérifient sur la table Ciqual de l'ANSES.
Et côté végétal ?
La vitamine D est d'origine animale ou fongique : côté végétal, seuls les champignons exposés aux ultraviolets en apportent, sous forme de vitamine D2. Pour une alimentation végétalienne, la supplémentation devient donc un sujet à part entière, avec une D3 d'origine lichen si vous écartez la lanoline.
Quelle est la meilleure vitamine D ?
La D3 (cholécalciférol) plutôt que la D2 : à dose égale, elle élève et maintient mieux le taux sanguin. Au-delà de ce choix, trois lignes d'étiquette départagent deux produits. La dose affichée en microgrammes ET en UI, qui rend la comparaison immédiate. L'origine de la D3 : lanoline ou lichen pour les versions végétales, chimiquement identiques. La forme galénique enfin : les gouttes huileuses permettent d'ajuster finement la dose, les gélules se transportent mieux. Au-delà de 4 000 UI par jour, on sort du cadre de l'automédication.
Comment fixer la vitamine D, et peut-on l'associer au magnésium ?
Deux leviers concrets. Le premier est le repas gras : sans lipides, l'absorption chute, quelle que soit la qualité du produit. Le second est le magnésium, cofacteur des enzymes qui transforment la vitamine D dans le foie puis dans le rein. Les prendre ensemble ne pose aucun problème et rien n'oblige à les espacer. Au-delà, aucune interaction problématique n'est documentée aux doses usuelles avec les micronutriments courants ; la seule précaution est comptable, additionnez les apports en vitamine D de tous vos produits. Nos rayons fer et vitamine E complètent la gamme.
Comment savoir où l'on en est ?
Par un dosage sanguin de 25-hydroxyvitamine D, si votre médecin le juge utile. L'interprétation du résultat, le choix d'une dose de correction et son suivi sont des actes médicaux. Un complément alimentaire sécurise un apport chez une personne en bonne santé ; pour tout ce qui relève de la carence, l'avis de votre médecin reste la référence.
Un manque de vitamine D fait-il prendre du poids ?
Le lien existe dans les données, dans un sens précis. La vitamine D est stockée dans le tissu adipeux : à apport égal, le taux sanguin est en moyenne plus bas chez les personnes en surpoids, parce qu'une part de la vitamine y est séquestrée. C'est donc le poids qui influence le taux. Aucune allégation européenne ne relie la vitamine D à la perte de poids, et la dose se décide avec votre médecin.
Peut-on faire un surdosage de vitamine D ?
Oui, et c'est la différence avec les vitamines hydrosolubles. La vitamine C et les vitamines du groupe B partent dans les urines en cas d'excès ; la vitamine D, liposoluble, s'accumule dans le foie et les tissus adipeux. Un apport excessif prolongé conduit à une hypercalcémie, avec un risque de calcification rénale et cardiovasculaire. Les cas rapportés impliquent presque toujours des doses très élevées prises longtemps, ou plusieurs produits cumulés. Respectez la dose de l'étiquette, additionnez vos sources, et ne franchissez pas 4 000 UI par jour sans encadrement médical.
Faut-il obligatoirement de la K2 avec sa vitamine D ?
Une D3 seule couvre les allégations osseuses, musculaires et immunitaires. La K2 est un complément d'approche, à écarter sous anticoagulant antivitamine K sans avis médical.
Faut-il en prendre toute l'année ?
Le raisonnement courant consiste à couvrir la période où la synthèse cutanée est faible ou nulle, d'octobre à mars. Une prise continue se discute selon le mode de vie, et cette décision comme la dose se prennent avec un professionnel de santé.
Que trouve-t-on de vitamine D chez nous ?
Des gouttes huileuses et des gélules de D3, seules ou associées à la K2, avec la dose affichée en microgrammes et en UI et l'origine du cholécalciférol précisée — lanoline ou lichen pour les versions végétales. Trois lignes à regarder pour choisir : la dose par goutte ou par gélule, l'origine de la D3, la présence ou non de K2. Nos références sont disponibles en ligne, expédiées partout en France et en Europe, et en rayon à Vendargues, à une dizaine de minutes de Montpellier.
