Multivitamins

What is a multivitamin actually for?

A multivitamin is an insurance policy for your intake, not a treatment and not a stimulant. It combines in a daily dose the thirteen vitamins and a portion of minerals needed in small quantities, at doses based on European nutritional reference values — the NRVs displayed as a percentage on labels.

Let's immediately state what a sales page rarely mentions: a multivitamin does not replace a varied diet, and for many people, it is useless. Those who eat vegetables, fruits, whole grains, animal proteins, or legumes already cover the essentials, and a tablet will not do better than what is already covered. The authorized claims subtly imply this: they speak of a contribution to normal functioning. "Vitamin B6 helps reduce fatigue" does not mean it gives energy to someone who isn't lacking it.

Each nutrient has its own claims, precisely regulated in wording, and all require the same condition: that the product be at least a "source of" that nutrient, meaning 15% of the NRV per serving. Three examples: "Zinc contributes to the normal function of the immune system" (from 1.5 mg), "Iron contributes to the reduction of fatigue" (from 2.1 mg), "Vitamin B12 contributes to normal energy-yielding metabolism" (from 0.375 µg).

Who benefits from taking one, and who doesn't?

A complete formula is genuinely beneficial in four situations, all of which involve restricting either the variety or the volume of food intake.

A restricted or repetitive diet. Few vegetables and fruits, always the same dishes, many processed foods: micronutrient coverage becomes erratic. A tablet only partially addresses this—it supplements intake but does not provide fiber or polyphenols.

A vegan diet. This is no longer a matter of convenience: vitamin B12 is absent from plants, and its supplementation is necessary, not optional; iron and zinc are almost exclusively found in poorly absorbed forms in plants. Our vitamin B section elaborates on this, and neither plant proteins nor spirulina negate the need for dedicated B12.

Prolonged caloric deficit. Below 1,500 kcal per day for several weeks, the micronutrient density of each bite becomes crucial and rarely sufficient: this is the case for a methodically executed weight loss phase.

High training load. Not because exertion "consumes vitamins" at a spectacular rate, but because high volume often comes with irregular meal times and a diet organized around proteins and carbohydrates more than variety. Sweat losses, on the other hand, are related to electrolytes.

Conversely, if you eat a varied diet, without excluding any food groups and without restriction, a multivitamin will likely not provide any measurable benefit. Targeted supplementation — vitamin D in winter, omega-3s if you don't eat fish — is more logical and less expensive.

Why is "200% of NRV" not an argument?

This is the most common and emptiest argument in the aisle. The NRV is not a minimum vital to exceed: it is a labeling value set to cover the needs of almost all adults. Displaying 200% means displaying double a value that is already sufficient.

For water-soluble vitamins — B group and vitamin C — the excess is excreted in urine: you pay for a dose that you eliminate, with the only visible effect being their bright yellow coloration, due to riboflavin. For fat-soluble vitamins and several minerals, the excess is not eliminated, it accumulates — and overdose ceases to be a simple unnecessary expense.

What matters on a label, therefore, is not the highest percentage, but the list of chemical forms, the presence of at-risk nutrients, and consistency with other supplements. If you are already taking magnesium, zinc, and vitamin D, do the math before adding a complete formula: this is where true overdoses occur.

Bisglycinate or oxide, folate or folic acid: do the forms make a difference?

Yes — it's even the most useful dividing line between two products at the same price.

Minerals: chelate versus inorganic salt. Magnesium oxide and zinc oxide are inexpensive and highly concentrated in elemental mineral, but poorly soluble: a significant portion passes through the intestine without being absorbed, and magnesium oxide is known for its laxative effect. Chelated forms — bisglycinate, the mineral bound to two glycine molecules — are better tolerated and less sensitive to phytates, but take up more space in a capsule: they are rarely found at low prices.

Folates: folic acid or 5-MTHF. Folic acid is the synthetic form, stable and well-documented; 5-methyltetrahydrofolate is already active and does not need to be converted. The commercial argument invokes MTHFR gene variants, which slow this conversion in a portion of the population. Without exaggeration: 5-MTHF is a perfectly valid form, but no European claim distinguishes it from folic acid — both carry the same wording, "Folates contribute to normal homocysteine metabolism."

Vitamin D: D3 rather than D2. At equal doses, cholecalciferol (D3) raises and maintains blood levels more effectively than ergocalciferol (D2). A serious formula specifies D3 and its origin, lanolin or lichen.

Vitamin E: d-alpha or dl-alpha. The natural form (d-alpha-tocopherol) is retained better by the body than the synthetic (dl-alpha): details are in our vitamin E section. For B12, cyanocobalamin and methylcobalamin work equally well for the vast majority of people.

Which nutrients should absolutely not be overdosed?

Four deserve particular vigilance, and this is the main reason to read a label before buying.

Iron. A general adult formula should not contain iron beyond the NRV, and many reputable manufacturers omit it. The body has no active elimination pathway for iron: what is absorbed accumulates. Iron supplementation should be decided after a blood test and medical advice, never blindly.

Vitamin A in retinol form. The European upper safety limit is 3,000 µg of retinol equivalents per day for adults, from all sources combined. Chronic excess is implicated in liver and bone damage, and retinol should be monitored during pregnancy. Beta-carotene is better regulated by the body, but authorities advise against high doses for smokers and former smokers.

Selenium. The gap between useful intake and excessive intake is narrow: 300 µg per day for the European safety limit, for an NRV of 55 µg. It's easy to accidentally combine two products containing it.

Zinc. Safety limit: 25 mg per day, from all sources combined. Beyond this and over time, it competes with copper for intestinal absorption and can deplete copper status — a topic developed in our zinc section.

Medical advice is essential before any supplementation during pregnancy or breastfeeding, for children and adolescents, in cases of renal or hepatic insufficiency, with long-term treatment, or in cases of chronic illness. This section is aimed at healthy adults.

Frequently Asked Questions

What is a multivitamin?

A formula that combines in a single daily dose the thirteen vitamins and, most often, a portion of minerals, at doses based on European nutritional reference values. It is neither a medicine, nor a stimulant, nor a meal replacement: it is a safety net for nutrient intake. Two products displaying the same percentages can be very different depending on the chemical forms used.

Why take a multivitamin?

To cover nutrient intake when the diet doesn't reliably do so: a diet that is not varied or repetitive, a vegan diet, prolonged caloric deficit, high training volume with irregular meal times. Outside of these cases, a varied diet already covers the need, and targeted supplementation — vitamin D in winter, omega-3s without fish — is more logical and less expensive than a formula with twenty-five ingredients.

Is it good to take vitamins every day?

At usual dosages, daily intake is not problematic. But it is only beneficial if the reason for taking it also persists: taken "out of habit" with an already varied diet, it produces no measurable effect. The real point of vigilance for long-term use is not the duration, but the accumulation with other products containing iron, selenium, zinc, or vitamin A. Review your intake once or twice a year, with your doctor if you are taking other supplements or medication.

When should multivitamins be taken?

With a meal, and preferably always the same one. Vitamins A, D, E, and K are fat-soluble, so they are better absorbed in the presence of fats. Breakfast or lunch are suitable; some people avoid taking them in the evening, as formulas rich in B vitamins can interfere with falling asleep.

How long does it take for a multivitamin to take effect?

There is no "effect" to feel. A supplement covers nutrient intake: if your intake was already sufficient, nothing will happen, and that is normal. A "boost" sensation within an hour of taking it comes from something else, often caffeine added to some sports formulas.

What is the best multivitamin?

There is no absolute "best," and the highest NRV percentage is the worst criterion. Four points are enough to decide between two boxes: are the chemical forms named (bisglycinate rather than oxide, D3 rather than D2); does the formula contain iron, which an adult generally doesn't need without a blood test; are the doses of selenium and vitamin A reasonable; and does it duplicate anything you are already taking. The best formula is one that complements your intake without doubling any of it.

What are the dangers of a multivitamin?

The danger does not come from the multivitamin alone at usual dosages, but from accumulation. Excess water-soluble vitamins are excreted in urine; fat-soluble vitamins and several minerals are not. Four nutrients require real vigilance: iron, which the body cannot actively eliminate; vitamin A in retinol form, limited to 3,000 µg per day; selenium, limited to 300 µg for an NRV of 55 µg; zinc, limited to 25 mg. Add up all your sources before adding a complete formula, and seek medical advice if pregnant, breastfeeding, with a chronic condition, or on long-term medication.

Which vitamin to take for fatigue?

Let's be precise, because this is the best-selling argument in the aisle. Several nutrients carry the claim "contributes to the reduction of fatigue": vitamins B2, B3, B5, B6, B9, B12, and C, as well as iron and magnesium. This claim applies to an intake that fills a deficiency — it does not mean that a supplement will energize someone whose intake is already adequate. Persistent fatigue that worsens or is accompanied by other symptoms is not a matter for supplements: it should be investigated with a consultation, and a blood test if your doctor deems it useful.

Which vitamins to take for bodybuilding?

No vitamin builds muscle: that role belongs to training, calories, and proteins. What micronutrition provides to an athlete is coverage for nutrient intake weakened by high volume and irregular meals: B vitamins for energy metabolism, vitamin D during periods of low sun exposure, magnesium and zinc, some of which are lost through sweat. For performance itself, the useful categories are elsewhere: creatine and electrolytes.

Which vitamins to take after 50?

Three points change: cutaneous vitamin D synthesis decreases, the absorption of dietary B12 becomes less efficient, and iron needs decrease in women after menopause. An adapted formula is therefore rather a formula without iron, well-supplied with D3 and B12. The choice should be discussed with a doctor, as long-term treatments are more common at this age.

Can vitamin C and magnesium be taken at the same time?

Yes, no problematic interaction is documented between these two at usual doses. The real competitions concern minerals among themselves: calcium and zinc hinder iron absorption, zinc and copper compete for the same transporters. If you are taking iron separately, space it two hours apart from calcium intake.

Should they be bought in a pharmacy or parapharmacy?

The point of sale makes no difference: a food supplement falls under the same regulatory framework regardless of the counter. What changes is the formula. Compare the chemical forms, the presence of iron, the doses of selenium and vitamin A — not the brand.

Is a multivitamin suitable during pregnancy?

This question falls entirely within medical supervision. Needs change, some general public formulas contain retinol which should be avoided, and folate supplementation around conception is subject to precise recommendations. Do not improvise: discuss it with your doctor or midwife.

What brands are found in this section?

We select formulas whose labels can be read without a decoder: chemical form named for each mineral, dose in actual units and not just as a percentage. Nutriting works with chelates and identifies its raw materials by their brand name. IO.Genix covers daily multivitamin and mineral formats oriented towards sports, Sinob a simple daily complex, Now Foods classic complete formulas. TrainedByJP and Universal Nutrition occupy the segment of multi-active packs for high training volumes: higher dosages, so combinations need to be checked. The rest of our micronutrition is in the vitamin C, vitamin D, ZMA, and probiotics sections; our sports nutrition guide positions each category.

Advice at a store near Montpellier?

Our Vendargues store, about ten minutes from Montpellier, is the most efficient place for this section: two boxes side-by-side, and comparison takes one minute on three lines — presence of iron, selenium dose, mineral forms. This is often where you see that a twenty-five-ingredient formula duplicates what you are already taking. We ship everywhere in France and Europe. We will tell you what a product contains and how to take it; we will not tell you if you are missing something, as that question belongs to your doctor.

Sources: ANSES for nutritional references and opinions on food supplements; Ciqual for food composition; EFSA for opinions underpinning authorized claims and upper safety limits.

To go further: the composition and use of Animal Pak and chromium picolinate, benefits, dosage, and side effects.