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What is IO Genix NAC600?
IO Genix NAC600 is a single-ingredient supplement. Each capsule provides 600 mg of N-acetylcysteine, and the rest of the formula comes down to the shell and an anti-caking agent. The bottle holds 60 capsules, which is two months of daily use.
N-acetylcysteine, abbreviated to NAC, is an acetylated derivative of L-cysteine, a sulphur-containing amino acid. Food supplies cysteine through animal protein, eggs, garlic and pulses. The acetylated form is more stable, which is why it is the one favoured in supplements.
Its biochemical interest rests on one precise point: cysteine is the rate-limiting amino acid in glutathione synthesis, glutathione being a tripeptide the body makes itself and one that takes part in the cellular mechanisms handling oxidative stress. Put another way, the availability of cysteine determines what the cell is able to produce. The rest of the Spanish range is in our IO Genix section, and the other products in the category in our NAC section.
What does one NAC600 capsule contain?
| Composition | Per capsule (daily serving) | % NRV |
|---|---|---|
| N-acetylcysteine | 600 mg | Not established |
| Shell | Gelatine capsule | |
| Anti-caking agent | Magnesium stearate | |
| Colourings, flavourings, added sugars | None | |
| Pack size | 60 capsules, that is two months at one capsule a day | |
600 mg per capsule is the benchmark dose for this molecule, and it fits into a single serving. That is a practical detail which matters more than it seems: many products in this category require you to swallow two or three capsules to reach the same amount. Here, one capsule in the morning and the day is taken care of.
The formula is about as short as you could imagine: the active, the shell, the anti-caking agent. No colouring, no flavouring, no added sugar, no additional complex. That is a sound selection criterion, and it lets you know exactly what you are taking and at what dose.
On the regulatory side, we should be blunt: no health claim is authorised in Europe for N-acetylcysteine or for cysteine. Not on oxidative stress, not on the body's defences, not on the airways, not on the liver. Cysteine's role as a precursor of glutathione is an established and documented fact of biochemistry; what oral supplementation actually produces in a healthy adult is another question, and one with no validated dossier at European level. So we describe the molecule and its dose, and promise nothing.
A final word on a statement we have removed from the previous version of this page: the manufacturer referred to a pharmaceutical grade raw material. That is a phrase we cannot verify and one that has no precise definition in the food supplement framework. We are not passing it on.
Ingredients list
N-acetylcysteine (600 mg per capsule), GELATINE (capsule shell), magnesium stearate (anti-caking agent). GMO-free, no artificial colouring, no added preservative.
May contain traces of GLUTEN, EGG, MILK, FISH and SOYA.
How do you take NAC600?
Serving: 1 capsule. Liquid: a large glass of water. Timing: in the morning on an empty stomach, 30 minutes before breakfast, or two hours after a meal. Frequency: one serving a day, not to be exceeded. Duration: a 2 to 3 month cycle, followed by a one-month break.
The instruction to avoid protein-rich meals around the time you take it is not a whim, and it deserves an explanation. N-acetylcysteine is an amino acid derivative: it uses the same intestinal transporters as the amino acids in a protein meal, and so ends up in direct competition with them. Taken with a protein shake or a plate of meat, it is absorbed far less efficiently. First thing in the morning on an empty stomach is the window that solves the problem.
If your mornings do not lend themselves to it, the two-hours-after-a-meal rule works just as well. What matters is not taking it right alongside a protein intake.
The manufacturer also recommends drinking at least two litres of water a day during the course. That is a standard instruction with sulphur compounds, and it costs nothing to follow.
Two to three months on, one month off: a bottle of 60 capsules covers two months, so one complete short cycle. This is not a product to take all year round without a break, and the manufacturer does not intend it that way.
It combines without redundancy with a vitamin C, a coenzyme Q10 or a standardised turmeric — three products from the same family of uses that do not act on the same pathways. Introduce them one at a time, a fortnight apart. A multivitamin complex can sit alongside it too, provided you check that it does not already supply cysteine.
Who is NAC600 right for, and who is it not right for?
It is aimed at a healthy adult, athletic or not, who wants a single active properly dosed rather than a twelve-line complex. That is the main appeal of this format: one ingredient, one dose, one capsule, no ambiguity.
It is not suitable for vegetarians or vegans: the shell is gelatine. That is the most frequent limitation across this range, and for some customers it decides the purchase.
The product is for adults only and must be kept out of reach of children. The manufacturer asks you to consult a healthcare professional before use if you are pregnant, breastfeeding or on medical treatment. That last situation deserves to be taken seriously: N-acetylcysteine is a molecule also used in a medical setting, and adding it to ongoing treatment is not a decision to take on your own.
It logically fits into a routine where the diet is already solid: no single active makes up for a shaky plate, and our protein section answers a far more fundamental need. A note on tolerance: at 600 mg and on an empty stomach, mild digestive discomfort is possible in the first few days for some people. It usually settles; if it persists, the two-hours-after-a-meal rule is a comfortable alternative.
The product may contain traces of gluten, egg, milk, fish and soya.
What not to expect from it: this is not a treatment, it is not a stimulant, and you will feel nothing when you take it — which is entirely normal for this type of molecule. Nor is it a performance or a weight-loss product. Any question relating to the airways, the liver or ongoing treatment is one for your doctor or your pharmacist, never for a capsule bought on its own.
NAC or glutathione as a supplement?
The question comes up constantly, and it has a clear answer that often comes as a surprise.
Glutathione sold directly as a supplement has a known problem: it is a tripeptide, and a swallowed tripeptide is largely cut apart by digestion before it reaches the circulation. It is a little like tipping an already-built brick into a wall: it will be knocked down at the door.
N-acetylcysteine takes the opposite route: it supplies the rate-limiting material the cell uses to make its own glutathione. That is what explains why it is widely preferred at doses which, for the same amount, cost less. That is the reasoning behind this product.
If what you need is instead a short-formula antioxidant from another family, three routes exist with us: vitamin C, the simplest and the best regulated; coenzyme Q10, which acts at mitochondrial level; and standardised turmeric. None is interchangeable with the others, and it is better to try one at a time than to stack three.
Frequently asked questions
Why take it on an empty stomach?
Because N-acetylcysteine uses the same intestinal transporters as the amino acids in a protein meal and ends up competing with them. Taken with a shake or a plate of meat, it is noticeably less well absorbed. First thing in the morning, or two hours after a meal, settles the matter.
How long does a bottle last?
Two months, at one capsule a day for 60 capsules. The manufacturer recommends cycles of two to three months followed by a one-month break: a bottle therefore covers one complete short cycle, which keeps the maths simple.
Are these capsules suitable for vegetarians?
No. The shell is gelatine, of animal origin. It is the most common limitation across this range and there is no plant-based version of this particular product.
Do you need to take breaks?
The manufacturer explicitly builds them in: one month off after two to three months of use. This is not a product for permanent use, and that alternation is part of the instructions rather than an optional precaution.
Do you feel anything?
No, and you should not expect to. It is a precursor that acts at cellular level, with no associated sensation. A product in this category that delivered a noticeable effect within the hour should arouse suspicion rather than satisfaction.
Can it be taken alongside medication?
Not without medical advice. The manufacturer explicitly asks for it, and the reason is a serious one: N-acetylcysteine is also a molecule used in a medical setting. If you are on treatment, the question is one for your doctor or your pharmacist before you buy.
Is there a taste or a smell?
The capsule masks most of it, which is welcome: N-acetylcysteine is a sulphur compound with a pronounced smell in powder form. That is in fact one of the arguments for the capsule format over powder versions of the same active.
Where can you buy IO Genix NAC600?
The 60-capsule bottle can be ordered from this page, and we ship throughout France and Europe. At the Vendargues store, about ten minutes from Montpellier, this is a product we are happy to sell, on one condition: that the customer accepts they will feel nothing. It is a background active, and saying so upfront heads off a good deal of disappointment ten days later. The rest of the category can be browsed in our sports nutrition section.
What is TrainedByJP Vital Support?
TrainedByJP Vital Support is a vegetable capsule complex bringing together five actives, every one of them quantified to the milligram. The bottle contains 240 capsules, or 30 servings of 8 capsules — a full month. It is a niche product, designed by British coach Jordan Peters, and it is nothing like an entry-level supplement.
The five components are astragalus (Astragalus membranaceus), N-acetylcysteine, IP6 (inositol hexaphosphate), TUDCA (tauroursodeoxycholic acid) and a maritime pine bark extract. The rest comes down to the hypromellose vegetable capsule and two anti-caking agents.
The key thing to take away first: none of these five actives carries a health claim authorised in Europe. Not for the liver, not for the kidneys, not for anything else. So what we describe here is a composition, doses and precautions — not effects. The product appears in the TrainedByJP collection.
What does a serving of 8 capsules contain?
| Active | Per serving (8 capsules) | % NRV |
|---|---|---|
| Astragalus (Astragalus membranaceus) | 4,000 mg | NRV not established |
| N-acetylcysteine (NAC) | 1,200 mg | NRV not established |
| IP6 (inositol hexaphosphate) | 1,000 mg | NRV not established |
| TUDCA (tauroursodeoxycholic acid) | 500 mg | NRV not established |
| Maritime pine bark extract | 60 mg | NRV not established |
| Servings per bottle | 30 (240 capsules) | — |
This is a rare table in this category: all five actives are quantified, with no proprietary blend and no "complex" to hide behind. With ingredients as expensive as TUDCA, that transparency has real value — it lets you compare against another product, which most brands in this sector make impossible.
Two doses are worth putting in context. The 4,000 mg of astragalus per serving make it the main active by weight. And the 500 mg of TUDCA: this is a bile acid, one of the most expensive ingredients on the supplement market, which goes a long way towards explaining the product's price positioning. The manufacturer does not specify whether these are standardised extracts, or to what ratio, and we are not going to invent that.
Let us say it again plainly, because it is the most useful piece of information on this page: astragalus, NAC, IP6, TUDCA and pine bark have no health claim authorised under European regulations. Any product page promising you organ protection is stepping outside the legal framework. What we can say, on the other hand, is factual: TUDCA influences bile production, which is why the precautions listed below apply.
How should you take Vital Support?
Dose: 8 capsules a day, split into two servings. Liquid: a glass of water with each serving, alongside a daily fluid intake of 2.5 to 3 litres. Timing: 4 capsules on waking, on an empty stomach or with a light breakfast, and 4 capsules before bed. Frequency: two servings a day. Duration: a course of 8 to 12 weeks, as recommended by the manufacturer.
Hydration is not a cosmetic detail here: the manufacturer explicitly puts a figure on it, 2.5 to 3 litres a day, which is well above what most people drink. If you do not intend to stick to that, this product is not for you.
Eight capsules a day is a significant amount to swallow. Splitting them morning and evening is not only a question of absorption: it is also what makes taking them manageable. The evening serving is taken before bed, with a large glass of water.
The manufacturer notes that this complex can be combined with omega 3 or with a B vitamin complex. Ask your doctor or pharmacist for advice before any use — that is the manufacturer's own recommendation, and we pass it on exactly as it stands.
Who is Vital Support right for, and who is it not right for?
This is a product for the informed user, someone who knows exactly what they are buying and why. If you are new to supplements, this is not where to start: a foundation of multivitamins or a plain N-acetylcysteine will cover more needs for far less money.
The precautions are numerous and serious. Pregnant or breastfeeding women: seek the advice of a healthcare professional before use. Anyone on medication: consult a healthcare professional, particularly in the case of liver or kidney treatment. Diagnosed liver or kidney disorders: medical consultation is mandatory before use. And one point specific to TUDCA: it influences bile production, so you should avoid the product in the case of gallstones or bile duct obstruction without medical advice.
On allergens, the list for the manufacturing site is particularly long: CELERY and CELERIAC, CRUSTACEANS, FISH, MILK, MUSTARD, PEANUTS, SOYA, GLUTEN, EGG, LUPIN and MOLLUSCS. If you have a severe allergy, take that into account.
What you should not expect from it: organ protection. No regulatory evidence allows that to be claimed, and a food supplement makes up for neither alcohol consumption, nor heavy medication, nor a medical condition. If you are worried about your liver or your kidneys, the answer is a blood test prescribed by a doctor — not a bottle of capsules.
Vital Support or NAC bought on its own?
That is the honest comparison to make, because NAC is by far the best known and most accessible of the five actives.
A NAC sold on its own is the better choice in two very common cases. First, price: N-acetylcysteine costs a fraction of this complex, and if it is NAC you are after, there is no reason to pay for four other ingredients. Second, dosing: you adjust it freely, whereas Vital Support fixes 1,200 mg within a serving that also contains 4 g of astragalus and 500 mg of TUDCA. It should be said that NAC on its own has no authorised claim in Europe either.
Vital Support keeps the advantage if it is precisely this combination that you are after. TUDCA in particular is virtually impossible to find on its own in France, and 500 mg per serving is a serious dose. Astragalus at 4 g and IP6 at 1 g round out an assembly that would be difficult and expensive to rebuild bottle by bottle. This is the product of a deliberate plan, not a top-up purchase.
Frequently asked questions
How long does a bottle last?
One month. The bottle contains 240 capsules and the daily serving is 8, which makes 30 servings. That amounts to a third of the 8 to 12-week course recommended by the manufacturer, so reckon on two to three bottles for a full course.
Do you really have to take 8 capsules a day?
Yes, that is the serving the doses in the table are based on. Cutting down to four capsules halves every intake. Splitting it into two servings, four in the morning and four in the evening, is what the manufacturer specifies.
What is TUDCA?
Tauroursodeoxycholic acid, a bile acid present here at 500 mg per serving. It influences bile production, which is what justifies the precautions regarding gallstones and bile duct obstruction. No health claim is authorised in Europe for this molecule.
Can it be taken alongside medical treatment?
Not without medical advice, and the manufacturer is categorical on this point — particularly in the case of liver or kidney treatment. If you are on any form of treatment, put the question to your doctor or pharmacist before opening the bottle.
Why do you have to drink so much water?
The manufacturer puts fluid intake at 2.5 to 3 litres a day during the course. That is an explicit instruction, not a general wellbeing recommendation: stick to it or choose another product.
Are the capsules suitable for vegetarians?
The shell is made from hypromellose, a plant cellulose, with no animal gelatine. The manufacturer does not, however, explicitly claim vegetarian or vegan certification in the data available to us, and we will not write it on their behalf.
Can it be combined with other supplements?
The manufacturer mentions that it can be combined with omega 3 or a multivitamin containing B vitamins. Just check the totals: if your multivitamin already contains NAC, as some complexes do, the amount adds up fast.
Where can you buy TrainedByJP Vital Support?
The 240-capsule bottle can be ordered from this page, and we ship throughout France and Europe. It is a product we stock because customers ask for it by name, and because the label puts a figure on all five of its actives — a criterion that matters more than the name on the box.
If you drop into our shop in Vendargues, about ten minutes from Montpellier, we will read the label with you and tell you straight whether a simpler product would do the same job in your situation. It often would.
What is IO Genix Stay Clean?
IO Genix Stay Clean is an antioxidant complex in gastro-resistant capsules. A two-capsule serving brings together ten active ingredients, including 500 mg of Setria L-glutathione, 300 mg of N-acetylcysteine, 200 mg of S-adenosyl-L-methionine, 150 mg of microencapsulated turmeric extract, 150 mg of milk thistle extract and 50 mg of coenzyme Q10. The 60-capsule bottle covers 30 days.
Three vitamins round out the formula — vitamin C, vitamin E and vitamin B2 — all three dosed at 50% of the nutrient reference value. As we shall see, they are the only ingredients in this product about which anything can be claimed.
Glutathione, the main ingredient, is a tripeptide the body makes from three amino acids, cysteine among them. The formula therefore works on two fronts at once: it supplies glutathione directly, and it also supplies N-acetylcysteine, the precursor of its synthesis. The rest of the Spanish range appears in our IO Genix section, and N-acetylcysteine sold on its own in our NAC section.
What does a serving of Stay Clean contain?
| Composition | Per 2 capsules (daily dose) | % NRV |
|---|---|---|
| Energy | 33 kJ / 8 kcal | — |
| Setria L-glutathione | 500 mg | Not established |
| N-acetylcysteine | 300 mg | Not established |
| S-adenosyl-L-methionine (SAMe) | 200 mg | Not established |
| Curcushine (microencapsulated turmeric extract, 26% curcumin) | 150 mg | Not established |
| Milk thistle extract | 150 mg | Not established |
| Choline bitartrate | 100 mg | Not established |
| Coenzyme Q10 | 50 mg | Not established |
| Vitamin C | 40 mg | 50% |
| Vitamin E | 6 mg | 50% |
| Vitamin B2 (riboflavin) | 0.7 mg | 50% |
Only three ingredients allow a claim to be made, and they are the three vitamins. At 50% of the reference value each, the thresholds are comfortably cleared: vitamin C, vitamin E and riboflavin contribute to the protection of cells from oxidative stress; vitamin C and riboflavin also contribute to the reduction of tiredness and fatigue. Those are the exact wordings, and they are the only ones we shall write.
For the other seven, no health claim is authorised in Europe: not for glutathione, not for N-acetylcysteine, not for S-adenosylmethionine, not for curcumin, not for milk thistle, not for coenzyme Q10. These are real ingredients, properly dosed, but their effect as supplements has no dossier approved at European level.
Two points of composition are worth spelling out, because they correct hasty readings. First, the turmeric: the 150 mg stated are of the microencapsulated extract, standardised to 26% curcumin. The amount of curcumin actually delivered is therefore in the region of 40 mg, not 150 mg. The distinction matters when comparing two products, and it deserves to be written down rather than left in the shade.
Second, the choline. It does have authorised claims, including one relating to the maintenance of normal liver function, but subject to a threshold of 82.5 mg of choline per portion. The 100 mg stated, however, refer to choline bitartrate, of which choline accounts for only about 41% by weight: that works out at roughly 41 mg of actual choline. The threshold is therefore not reached and the claim does not apply.
One technical point to finish with, and it is to the manufacturer's credit: the capsules are gastro-resistant. In a formula containing glutathione and S-adenosylmethionine, two molecules sensitive to stomach acid, that choice is not decorative.
Ingredients list
Setria L-glutathione, N-acetylcysteine, coating agent (GELATINE), S-adenosyl-L-methionine, Curcushine (Curcuma longa extract at 26% curcumin, maltodextrin, antioxidant: ascorbic acid, rosemary extract), milk thistle extract (Silybum marianum), bulking agent (microcrystalline cellulose), choline bitartrate, vitamin C (L-ascorbic acid), coenzyme Q10, vitamin E (D,L-alpha-tocopheryl acetate), anti-caking agents (magnesium stearate, silicon dioxide), vitamin B2 (riboflavin).
May contain traces of GLUTEN, MILK, EGGS, SOYA and FISH. Made in a facility that handles these allergens.
How should you take Stay Clean?
Dose: 2 capsules. Liquid: a large glass of water, 300 ml. Timing: one capsule at breakfast, one at lunch, with meals. Frequency: two capsules a day, not to be exceeded. Duration: continuous use for 8 to 12 weeks.
Swallow the capsules whole, without opening or chewing them. This is not a comfort measure: the gastro-resistant coating is what allows the most fragile molecules in the formula to get past the stomach. An opened capsule loses part of its point.
Taking it with a meal follows a clear logic: the formula contains vitamin E and coenzyme Q10, two compounds that need fat to be properly absorbed. A meal containing a minimum of fat does the job.
The manufacturer puts the course at between 8 and 12 weeks. One bottle covers thirty days, so you need to allow for two or three to see it through. With this kind of active ingredient, nothing can be judged in two weeks, and it is better to know that before buying.
The product combines without overlap with an omega 3 or a B vitamin complex, as the manufacturer suggests. On the other hand, it does duplicate several products in this category: if you already take N-acetylcysteine on its own, coenzyme Q10 or a standardised turmeric, you will find them here. Check your labels before stacking.
Who is Stay Clean for, and who is it not for?
It is aimed at healthy adults who want to bring several actives from the antioxidant family into a single serving, rather than lining up four bottles on a shelf. That is its main selling point, and it is a genuine one: ten ingredients, all quantified, in two capsules.
The exclusions here are worded unusually firmly, and they need to be read. The product is not recommended for under-18s, and the manufacturer states in black and white that pregnant and breastfeeding women must not use this product — a more categorical wording than the usual “seek advice”. People on medical treatment or with liver disorders must consult a healthcare professional before use.
That last mention deserves to be understood: the formula contains milk thistle and S-adenosylmethionine, two ingredients whose place in someone with a liver condition is not something to improvise. This is not a product intended to address a liver problem — quite the opposite.
The capsules are made of gelatine: this product is suitable for neither vegetarians nor vegans. It may contain traces of gluten, milk, eggs, soya and fish.
What you should not expect from it: you will feel nothing when you take it, and that is normal for an antioxidant formula. It is not a treatment, not a performance product, and not an answer to entrenched tiredness. The word “detox”, which products of this kind attract, has no regulatory definition: the liver and kidneys do that work on their own, and no capsule improves on it in a healthy person.
Antioxidant complex or single active?
That is the only trade-off that matters with this kind of product, and it depends on exactly what you are looking for.
This complex has one obvious advantage: ten actives, one serving, one bottle. For someone who wanted glutathione, N-acetylcysteine and coenzyme Q10 anyway, it saves three purchases and three separate intakes. The three vitamins alongside them are, moreover, the only ingredients genuinely covered by regulation, and they are properly dosed.
A single active makes the opposite choice: markedly higher doses of one molecule. Our dedicated section offers N-acetylcysteine at twice what this formula contains; our coenzyme Q10 and turmeric sections do the same in their own registers. That is more precise, easier to compare, and often cheaper if you are after a single ingredient.
Our position across the counter: if you know which of these ten actives interests you, take it on its own and properly dosed. If you want broad coverage in one serving, this complex does the job. And if your need is simply for the best-regulated antioxidants, a vitamin C and a vitamin E cost a fraction of the price and do have authorised claims.
Frequently asked questions
How much curcumin is there really?
The 150 mg stated correspond to the microencapsulated extract, standardised to 26% curcumin: that represents about 40 mg of curcumin. The distinction is essential when comparing with another product, where the 150 mg might refer to the curcumin itself.
Why gastro-resistant capsules?
Because glutathione and S-adenosylmethionine are sensitive to stomach acid. The coating delays release. It is a genuine formulation choice, and it is also why you should never open or chew the capsules.
Is this product suitable for vegetarians?
No. The capsule shell is made of gelatine, which is of animal origin. It is a common limitation in this range, and there is no plant-based version of this product.
Does the choline allow a claim?
Not here. Choline does have authorised claims, but they require 82.5 mg of choline per portion. The 100 mg stated refer to choline bitartrate, of which choline accounts for only about 41%: the threshold is not reached.
How long does a bottle last?
Thirty days: 60 capsules, two a day. As the manufacturer recommends a course of 8 to 12 weeks, allow two to three bottles to see a full course through.
Can it be taken if you have a liver problem?
Not without medical advice, and the manufacturer asks for it explicitly. The formula contains milk thistle and S-adenosylmethionine: their place in someone with a liver condition is a matter for a doctor, not a personal choice.
Does it duplicate other supplements?
Very probably, if you already have a routine. N-acetylcysteine, coenzyme Q10, turmeric, milk thistle and vitamins C and E are among the most common supplements around. Read your labels again: stacking adds nothing and can push you over intake levels without your knowing.
Where can you buy IO Genix Stay Clean?
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, we always ask to see what the customer is already taking before recommending this bottle: with a ten-ingredient complex, the risk is not a shortfall, it is repetition. The rest of the category can be browsed in our sports nutrition section.
What is NAC, and how is it related to cysteine?
NAC is the abbreviation for N-acetyl-L-cysteine. It is a molecule derived from L-cysteine, one of the sulfur-containing dietary amino acids, naturally found in egg, milk, meat, and some legume proteins.
The difference lies in a single chemical detail, and it is not insignificant: an acetyl group has been grafted onto cysteine's amine function. The molecule gains stability — free cysteine easily oxidizes to cystine, a much less soluble dimer, while the acetylated form is more resistant and can be stored without difficulty. This is a reason for formulation, not a promise of effect.
The second point widely discussed on this subject deserves to be stated for what it is: biochemistry. Glutathione is a tripeptide composed of three amino acids: glutamic acid, cysteine, and glycine. In this synthesis, cysteine availability is the limiting factor — the other two are abundant. It is this relationship, and this alone, that explains why NAC so often comes up in discussions about glutathione. Describing a metabolic pathway is not asserting a benefit: no health claims are authorized in Europe for NAC or glutathione, and we will not make any on this page.
What is the regulatory status of NAC in France and Europe?
This is the most important question on this page, and the honest answer is that it has not been uniformly decided. We prefer to state this rather than suggest a simple situation.
First fact: in France, acetylcysteine is primarily an active substance in medicines. It is used as a mucolytic in well-known specialties — Mucomyst, Exomuc, Fluimucil, Mucodrill — and, by injection, as an antidote in paracetamol poisoning, a strictly hospital use.
Second fact: there is no harmonized positive list at the European level for this type of substance. European regulations on food supplements only harmonize vitamins and minerals; for other substances with nutritional or physiological purposes, each Member State applies its own rules, supplemented by mutual recognition. The same molecule can therefore be sold as a supplement in one country and considered a medicine in a neighboring country.
Third fact: several European authorities reason by dose threshold. The Luxembourg Food Safety Division thus publishes a fact sheet stating that beyond 300 mg per day for adults — 100 mg for 6 to 12 years, 50 mg for 3 to 5 years — a product containing acetylcysteine falls under medicinal products and cannot be placed on the market as a food supplement. This sheet explicitly refers to the positions taken by the DGCCRF in France, the AFMPS in Belgium, and the BfArM in Germany, which follow a comparable logic. In other words, classification depends as much on the dose as on the molecule.
Fourth fact: the debate was lively in the United States. Starting in 2020, the FDA argued that NAC is excluded from the definition of a food supplement, on the grounds that it was approved as a drug before being marketed as a food. After several appeals from the industry, the agency published a final tolerance position on August 1, 2022: no prosecution against certain products, pending the outcome of a possible regulatory procedure. Tolerance is not authorization, and the situation remains provisional.
What should be remembered, without disguising it: the status of NAC as a food supplement is fluid, depends on the country, and depends on the dosage. A product legally marketed today is not necessarily so everywhere or definitively. And in all cases, no health claims are authorized: neither on the liver, nor on the respiratory tract, nor on immunity, nor on detoxification. Any page that makes such a claim goes beyond the scope.
Why does NAC smell like sulfur?
This is the first observation anyone makes when opening a jar, and it is not abnormal. Cysteine and its derivatives carry a thiol group, a sulfur atom bonded to hydrogen — exactly the compounds that give hard-boiled eggs, crushed garlic, or cooked cabbage their smell.
This distinctly sulfurous odor is therefore a marker of the molecule, not a manufacturing defect or a sign of degradation. It is stronger in powder form than in capsules, which explains why most manufacturers prefer capsules. No process eliminates it: a NAC that smelled of nothing would be more surprising than a NAC that smells of sulfur.
How to read a label, and at what dose?
Three practical checks before purchasing.
The dose per capsule, in milligrams of N-acetyl-L-cysteine. The most common formats are 600 mg and 750 mg. Given the thresholds adopted by several European authorities, this figure is not a detail: it determines the category into which a product falls, and it justifies medical advice before any regular use.
The exact form: N-acetyl-L-cysteine, the L-isomer. Some formulas combine it with glutamine, glycine, taurine, or plant extracts and become complexes for which the entire list must be read, with each ingredient adding its own precautions.
The planned number of daily doses, in the instructions for use: a vague label on this prevents you from knowing what you consume in a day. Follow the manufacturer's dose without doubling it, and do not combine several products containing the same substance — a reflex that also applies to our multivitamin and vitamin C sections.
What precautions should be known?
This section is the most important on the page after the one on regulatory status.
- Asthma and bronchial hyperresponsiveness. Bronchospasms have been described with acetylcysteine, mainly in inhaled form, but caution is generally advised: anyone with asthma should seek their doctor's advice before considering this type of product.
- Ongoing treatments. An interaction is documented with nitrate derivatives such as trinitrine, whose vasodilatory effect may be enhanced. Caution is also advised when taking anticoagulants or antiplatelet agents. If you are taking any long-term treatment, the question should be posed to your doctor or pharmacist.
- Stomach. Nausea, heartburn, and diarrhea are the most frequently reported side effects, especially at high doses or on an empty stomach. A history of peptic ulcer justifies medical advice.
- Pregnancy, breastfeeding, children, and adolescents. This section is for adults. In these situations, the decision rests with a healthcare professional.
- Chronic pathologies. Any known hepatic, renal, respiratory, or hematological condition excludes self-medication.
And a reminder that applies to this entire section: a food supplement treats nothing, diagnoses nothing, and never replaces a prescription. If you have a health question, the answer is with your doctor.
Frequently Asked Questions
What is NAC?
The abbreviation for N-acetyl-L-cysteine, a molecule derived from cysteine, one of the sulfur-containing dietary amino acids. An acetyl group has been grafted onto cysteine to stabilize it — in its free form, it oxidizes very quickly. Two things to know before going further: it smells strongly of sulfur, which is normal, and its regulatory status varies by country and dose, as acetylcysteine is primarily, in France, an active pharmaceutical ingredient.
What is NAC 600?
Simply a capsule containing 600 mg of N-acetyl-L-cysteine — the most common format on the market, along with 750 mg. It is neither a patented formula nor a particular quality: it is a dosage figure. However, it deserves your attention, as several European authorities consider 300 mg per day for adults to be the threshold beyond which an acetylcysteine-based product transitions into the medicine category. A 600 mg dosage is therefore, by design, a subject to be discussed with a healthcare professional rather than a routine purchase.
Are NAC and Mucomyst the same molecule?
The molecule is the same — acetylcysteine — but the two products are not interchangeable, and this is an important point. Mucomyst and its equivalents (Exomuc, Fluimucil, Mucodrill) are medicines: they have marketing authorization, precise indications, an evaluated dosage, a leaflet, and pharmacovigilance. A food supplement has none of this. Practical consequences: a supplement does not replace a prescribed medicine, it should not be taken "instead of" for a cough or bronchial congestion, and it should not be added without advice. If it is a medicine you need, the interlocutor is the pharmacist or doctor. As for the use of acetylcysteine as an antidote to paracetamol poisoning, it is strictly for hospital use, by injection, and has no relation to a jar of capsules.
Is NAC authorized in France as a food supplement?
The honest answer is nuanced. In France, acetylcysteine is primarily an active substance in mucolytic medicines and a hospital antidote. For use as a food supplement, there is no harmonized positive list at the European level covering this type of substance: each state applies its rules, supplemented by mutual recognition, and several authorities reason by dose threshold rather than by a principled prohibition. The status is therefore fluid, varying by country and by dosage. We prefer to state this rather than suggest a stable situation.
What are the benefits of NAC?
We will not answer this, and it is deliberate. No health claims are authorized in Europe for N-acetyl-L-cysteine: neither on the liver, nor on the respiratory tract, nor on immunity, nor on what is called detoxification. What can be described without going beyond the scope is limited to chemistry: an acetylated derivative of cysteine, which is the limiting amino acid in glutathione synthesis. Any sales page that goes beyond this makes an unauthorized claim. Questions about expected benefits should be directed to a doctor.
What are the benefits of glutathione?
Same answer, and for the same reason: no health claims are authorized in Europe for glutathione. What can be described is what it is: a tripeptide formed from glutamic acid, cysteine, and glycine, present in all our cells, whose synthesis is limited by cysteine availability — hence the constant link with NAC. A useful clarification, however: glutathione taken directly orally is largely degraded in the digestive tract, which is an argument for bioavailability, not proof that another product would be better.
What is the difference with cysteine or cystine?
All three are related. Cysteine is the basic amino acid, present in dietary proteins; unstable, it oxidizes quickly. Cystine is the dimer formed by two cysteines linked by a disulfide bond, more stable but much less soluble. N-acetyl-L-cysteine has an acetyl group that stabilizes it while keeping it soluble. Three forms of the same family, chosen for formulation reasons.
How and when to take NAC?
Follow the manufacturer's instructions for use: this is the only defensible answer in the absence of a reference dosage for food use. Taking it between meals is often recommended, but it increases the risk of nausea and heartburn; if the stomach protests, taking it with a meal usually solves the problem. Swallow the capsule with a large glass of water, never compensate for digestive discomfort by increasing the dose, and do not combine two products containing the same substance. If you are taking medication — nitrate derivatives, anticoagulants, antiplatelet agents — or if you are asthmatic, the question of "when" comes after "should I," and that should be asked of a doctor.
Can it be combined with other supplements?
Technically nothing prevents it, and many formulas on the market are already complexes. Two caveats. The first is accounting: add up the doses of all your products, because multi-ingredient complexes make it easy to miss cumulative amounts. The second concerns the interactions described above. If you are taking medication, the question is for your pharmacist or doctor, not a product page.
Is there any benefit in bodybuilding?
Nothing confirms this, and we do not present it as a performance aid: no claims are authorized for strength, endurance, or recovery. Products whose effect on training is genuinely documented are elsewhere — creatine monohydrate first and foremost, proteins to meet needs, beta-alanine for certain types of effort. Our sports nutrition guide prioritizes them.
Where to find N-acetylcysteine?
Two channels, and they should not be confused. In pharmacies, as a mucolytic medicine, with a leaflet and a pharmacist to advise you. As a food supplement, on this page — with shipping throughout France and Europe — or in our store in Vendargues, ten minutes from Montpellier, with 2-hour pickup. For this product more than others, we will first ask you if you are on medication and if you are asthmatic: depending on the answer, we will refer you to your pharmacist rather than selling you anything.
What brands do we offer?
We select formulas whose labels clearly indicate the form, dose per capsule, and expected number of doses, without health claims. These include IO Genix and TrainedByJP. The rest of our micronutrition is distributed among the multivitamin, omega 3, and sports nutrition sections.
A discussion in store near Montpellier?
On such a regulated subject, it is better to ask questions than to rely on what circulates online. Our store in Vendargues, about ten minutes from Montpellier, allows you to read a label together: form, dose per capsule, complete composition of a complex. We also ship throughout France and Europe. Our limit is clear: we will tell you what a product contains, never what it would do for you — that conversation belongs to your doctor.
Sources: the technical sheet of the Luxembourg Food Safety Division for dose thresholds and cited national positions; the FDA for its final position of August 1, 2022; EFSA and the European register of health claims, which authorizes none for this substance; ANSES for the framework applicable to food supplements. This page is for informational purposes and does not replace medical advice.
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What is NAC, and how is it related to cysteine?
NAC is the abbreviation for N-acetyl-L-cysteine. It is a molecule derived from L-cysteine, one of the sulfur-containing dietary amino acids, naturally found in egg, milk, meat, and some legume proteins.
The difference lies in a single chemical detail, and it is not insignificant: an acetyl group has been grafted onto cysteine's amine function. The molecule gains stability — free cysteine easily oxidizes to cystine, a much less soluble dimer, while the acetylated form is more resistant and can be stored without difficulty. This is a reason for formulation, not a promise of effect.
The second point widely discussed on this subject deserves to be stated for what it is: biochemistry. Glutathione is a tripeptide composed of three amino acids: glutamic acid, cysteine, and glycine. In this synthesis, cysteine availability is the limiting factor — the other two are abundant. It is this relationship, and this alone, that explains why NAC so often comes up in discussions about glutathione. Describing a metabolic pathway is not asserting a benefit: no health claims are authorized in Europe for NAC or glutathione, and we will not make any on this page.
What is the regulatory status of NAC in France and Europe?
This is the most important question on this page, and the honest answer is that it has not been uniformly decided. We prefer to state this rather than suggest a simple situation.
First fact: in France, acetylcysteine is primarily an active substance in medicines. It is used as a mucolytic in well-known specialties — Mucomyst, Exomuc, Fluimucil, Mucodrill — and, by injection, as an antidote in paracetamol poisoning, a strictly hospital use.
Second fact: there is no harmonized positive list at the European level for this type of substance. European regulations on food supplements only harmonize vitamins and minerals; for other substances with nutritional or physiological purposes, each Member State applies its own rules, supplemented by mutual recognition. The same molecule can therefore be sold as a supplement in one country and considered a medicine in a neighboring country.
Third fact: several European authorities reason by dose threshold. The Luxembourg Food Safety Division thus publishes a fact sheet stating that beyond 300 mg per day for adults — 100 mg for 6 to 12 years, 50 mg for 3 to 5 years — a product containing acetylcysteine falls under medicinal products and cannot be placed on the market as a food supplement. This sheet explicitly refers to the positions taken by the DGCCRF in France, the AFMPS in Belgium, and the BfArM in Germany, which follow a comparable logic. In other words, classification depends as much on the dose as on the molecule.
Fourth fact: the debate was lively in the United States. Starting in 2020, the FDA argued that NAC is excluded from the definition of a food supplement, on the grounds that it was approved as a drug before being marketed as a food. After several appeals from the industry, the agency published a final tolerance position on August 1, 2022: no prosecution against certain products, pending the outcome of a possible regulatory procedure. Tolerance is not authorization, and the situation remains provisional.
What should be remembered, without disguising it: the status of NAC as a food supplement is fluid, depends on the country, and depends on the dosage. A product legally marketed today is not necessarily so everywhere or definitively. And in all cases, no health claims are authorized: neither on the liver, nor on the respiratory tract, nor on immunity, nor on detoxification. Any page that makes such a claim goes beyond the scope.
Why does NAC smell like sulfur?
This is the first observation anyone makes when opening a jar, and it is not abnormal. Cysteine and its derivatives carry a thiol group, a sulfur atom bonded to hydrogen — exactly the compounds that give hard-boiled eggs, crushed garlic, or cooked cabbage their smell.
This distinctly sulfurous odor is therefore a marker of the molecule, not a manufacturing defect or a sign of degradation. It is stronger in powder form than in capsules, which explains why most manufacturers prefer capsules. No process eliminates it: a NAC that smelled of nothing would be more surprising than a NAC that smells of sulfur.
How to read a label, and at what dose?
Three practical checks before purchasing.
The dose per capsule, in milligrams of N-acetyl-L-cysteine. The most common formats are 600 mg and 750 mg. Given the thresholds adopted by several European authorities, this figure is not a detail: it determines the category into which a product falls, and it justifies medical advice before any regular use.
The exact form: N-acetyl-L-cysteine, the L-isomer. Some formulas combine it with glutamine, glycine, taurine, or plant extracts and become complexes for which the entire list must be read, with each ingredient adding its own precautions.
The planned number of daily doses, in the instructions for use: a vague label on this prevents you from knowing what you consume in a day. Follow the manufacturer's dose without doubling it, and do not combine several products containing the same substance — a reflex that also applies to our multivitamin and vitamin C sections.
What precautions should be known?
This section is the most important on the page after the one on regulatory status.
- Asthma and bronchial hyperresponsiveness. Bronchospasms have been described with acetylcysteine, mainly in inhaled form, but caution is generally advised: anyone with asthma should seek their doctor's advice before considering this type of product.
- Ongoing treatments. An interaction is documented with nitrate derivatives such as trinitrine, whose vasodilatory effect may be enhanced. Caution is also advised when taking anticoagulants or antiplatelet agents. If you are taking any long-term treatment, the question should be posed to your doctor or pharmacist.
- Stomach. Nausea, heartburn, and diarrhea are the most frequently reported side effects, especially at high doses or on an empty stomach. A history of peptic ulcer justifies medical advice.
- Pregnancy, breastfeeding, children, and adolescents. This section is for adults. In these situations, the decision rests with a healthcare professional.
- Chronic pathologies. Any known hepatic, renal, respiratory, or hematological condition excludes self-medication.
And a reminder that applies to this entire section: a food supplement treats nothing, diagnoses nothing, and never replaces a prescription. If you have a health question, the answer is with your doctor.
Frequently Asked Questions
What is NAC?
The abbreviation for N-acetyl-L-cysteine, a molecule derived from cysteine, one of the sulfur-containing dietary amino acids. An acetyl group has been grafted onto cysteine to stabilize it — in its free form, it oxidizes very quickly. Two things to know before going further: it smells strongly of sulfur, which is normal, and its regulatory status varies by country and dose, as acetylcysteine is primarily, in France, an active pharmaceutical ingredient.
What is NAC 600?
Simply a capsule containing 600 mg of N-acetyl-L-cysteine — the most common format on the market, along with 750 mg. It is neither a patented formula nor a particular quality: it is a dosage figure. However, it deserves your attention, as several European authorities consider 300 mg per day for adults to be the threshold beyond which an acetylcysteine-based product transitions into the medicine category. A 600 mg dosage is therefore, by design, a subject to be discussed with a healthcare professional rather than a routine purchase.
Are NAC and Mucomyst the same molecule?
The molecule is the same — acetylcysteine — but the two products are not interchangeable, and this is an important point. Mucomyst and its equivalents (Exomuc, Fluimucil, Mucodrill) are medicines: they have marketing authorization, precise indications, an evaluated dosage, a leaflet, and pharmacovigilance. A food supplement has none of this. Practical consequences: a supplement does not replace a prescribed medicine, it should not be taken "instead of" for a cough or bronchial congestion, and it should not be added without advice. If it is a medicine you need, the interlocutor is the pharmacist or doctor. As for the use of acetylcysteine as an antidote to paracetamol poisoning, it is strictly for hospital use, by injection, and has no relation to a jar of capsules.
Is NAC authorized in France as a food supplement?
The honest answer is nuanced. In France, acetylcysteine is primarily an active substance in mucolytic medicines and a hospital antidote. For use as a food supplement, there is no harmonized positive list at the European level covering this type of substance: each state applies its rules, supplemented by mutual recognition, and several authorities reason by dose threshold rather than by a principled prohibition. The status is therefore fluid, varying by country and by dosage. We prefer to state this rather than suggest a stable situation.
What are the benefits of NAC?
We will not answer this, and it is deliberate. No health claims are authorized in Europe for N-acetyl-L-cysteine: neither on the liver, nor on the respiratory tract, nor on immunity, nor on what is called detoxification. What can be described without going beyond the scope is limited to chemistry: an acetylated derivative of cysteine, which is the limiting amino acid in glutathione synthesis. Any sales page that goes beyond this makes an unauthorized claim. Questions about expected benefits should be directed to a doctor.
What are the benefits of glutathione?
Same answer, and for the same reason: no health claims are authorized in Europe for glutathione. What can be described is what it is: a tripeptide formed from glutamic acid, cysteine, and glycine, present in all our cells, whose synthesis is limited by cysteine availability — hence the constant link with NAC. A useful clarification, however: glutathione taken directly orally is largely degraded in the digestive tract, which is an argument for bioavailability, not proof that another product would be better.
What is the difference with cysteine or cystine?
All three are related. Cysteine is the basic amino acid, present in dietary proteins; unstable, it oxidizes quickly. Cystine is the dimer formed by two cysteines linked by a disulfide bond, more stable but much less soluble. N-acetyl-L-cysteine has an acetyl group that stabilizes it while keeping it soluble. Three forms of the same family, chosen for formulation reasons.
How and when to take NAC?
Follow the manufacturer's instructions for use: this is the only defensible answer in the absence of a reference dosage for food use. Taking it between meals is often recommended, but it increases the risk of nausea and heartburn; if the stomach protests, taking it with a meal usually solves the problem. Swallow the capsule with a large glass of water, never compensate for digestive discomfort by increasing the dose, and do not combine two products containing the same substance. If you are taking medication — nitrate derivatives, anticoagulants, antiplatelet agents — or if you are asthmatic, the question of "when" comes after "should I," and that should be asked of a doctor.
Can it be combined with other supplements?
Technically nothing prevents it, and many formulas on the market are already complexes. Two caveats. The first is accounting: add up the doses of all your products, because multi-ingredient complexes make it easy to miss cumulative amounts. The second concerns the interactions described above. If you are taking medication, the question is for your pharmacist or doctor, not a product page.
Is there any benefit in bodybuilding?
Nothing confirms this, and we do not present it as a performance aid: no claims are authorized for strength, endurance, or recovery. Products whose effect on training is genuinely documented are elsewhere — creatine monohydrate first and foremost, proteins to meet needs, beta-alanine for certain types of effort. Our sports nutrition guide prioritizes them.
Where to find N-acetylcysteine?
Two channels, and they should not be confused. In pharmacies, as a mucolytic medicine, with a leaflet and a pharmacist to advise you. As a food supplement, on this page — with shipping throughout France and Europe — or in our store in Vendargues, ten minutes from Montpellier, with 2-hour pickup. For this product more than others, we will first ask you if you are on medication and if you are asthmatic: depending on the answer, we will refer you to your pharmacist rather than selling you anything.
What brands do we offer?
We select formulas whose labels clearly indicate the form, dose per capsule, and expected number of doses, without health claims. These include IO Genix and TrainedByJP. The rest of our micronutrition is distributed among the multivitamin, omega 3, and sports nutrition sections.
A discussion in store near Montpellier?
On such a regulated subject, it is better to ask questions than to rely on what circulates online. Our store in Vendargues, about ten minutes from Montpellier, allows you to read a label together: form, dose per capsule, complete composition of a complex. We also ship throughout France and Europe. Our limit is clear: we will tell you what a product contains, never what it would do for you — that conversation belongs to your doctor.
Sources: the technical sheet of the Luxembourg Food Safety Division for dose thresholds and cited national positions; the FDA for its final position of August 1, 2022; EFSA and the European register of health claims, which authorizes none for this substance; ANSES for the framework applicable to food supplements. This page is for informational purposes and does not replace medical advice.
Questions fréquentes — NAC
La NAC, c'est quoi ?
L'abréviation de N-acétyl-L-cystéine, une molécule dérivée de la cystéine, l'un des acides aminés soufrés de l'alimentation. Un groupement acétyle a été greffé sur la cystéine pour la stabiliser — sous sa forme libre, elle s'oxyde très vite. Deux choses à savoir avant d'aller plus loin : elle sent fortement le soufre, ce qui est normal, et son statut réglementaire varie selon les pays et selon la dose, l'acétylcystéine étant d'abord, en France, une substance active de médicaments.
Qu'est-ce que le NAC 600 ?
Simplement une gélule dosant 600 mg de N-acétyl-L-cystéine — le format le plus répandu du marché, avec le 750 mg. Ce n'est ni une formule brevetée ni une qualité particulière : c'est un chiffre de dosage. Il mérite pourtant votre attention, car plusieurs autorités européennes situent autour de 300 mg par jour chez l'adulte la frontière au-delà de laquelle un produit à base d'acétylcystéine bascule dans la catégorie du médicament. Un dosage à 600 mg est donc, par construction, un sujet à aborder avec un professionnel de santé plutôt qu'un achat de routine.
NAC et Mucomyst, est-ce la même molécule ?
La molécule est la même — l'acétylcystéine — mais les deux produits n'ont rien d'interchangeable, et c'est un point important. Le Mucomyst et ses équivalents (Exomuc, Fluimucil, Mucodrill) sont des médicaments : ils ont une autorisation de mise sur le marché, des indications précises, une posologie évaluée, une notice et une pharmacovigilance. Un complément alimentaire n'a rien de tout cela. Conséquences pratiques : un complément ne remplace pas un médicament prescrit, il ne se prend pas « à la place » pour une toux ou un encombrement bronchique, et il ne doit pas s'y ajouter sans avis. Si c'est un médicament qu'il vous faut, l'interlocuteur est le pharmacien ou le médecin. Quant à l'usage de l'acétylcystéine comme antidote de l'intoxication au paracétamol, il est strictement hospitalier, par voie injectable, et n'a aucun rapport avec un pot de gélules.
La NAC est-elle autorisée en France comme complément alimentaire ?
La réponse honnête est nuancée. En France, l'acétylcystéine est avant tout une substance active de médicaments mucolytiques et un antidote hospitalier. Pour l'usage en complément alimentaire, il n'existe pas de liste positive harmonisée au niveau européen couvrant ce type de substance : chaque État applique ses règles, complétées par la reconnaissance mutuelle, et plusieurs autorités raisonnent en seuil de dose plutôt qu'en interdiction de principe. Le statut est donc mouvant, variable selon le pays et selon le dosage. Nous préférons l'écrire plutôt que de laisser croire à une situation stabilisée.
Quels sont les bienfaits de la NAC ?
Nous n'y répondrons pas, et c'est délibéré. Aucune allégation de santé n'est autorisée en Europe pour la N-acétyl-L-cystéine : ni sur le foie, ni sur les voies respiratoires, ni sur l'immunité, ni sur ce que l'on appelle la détoxification. Ce que l'on peut décrire sans sortir du cadre s'arrête à la chimie : un dérivé acétylé de la cystéine, laquelle est l'acide aminé limitant de la synthèse du glutathion. Toute page de vente qui va au-delà formule une allégation non autorisée. Les questions de bénéfice attendu se posent à un médecin.
Quels sont les bienfaits du glutathion ?
Même réponse, et pour la même raison : aucune allégation de santé n'est autorisée en Europe pour le glutathion. Ce que l'on peut décrire, c'est ce qu'il est : un tripeptide formé d'acide glutamique, de cystéine et de glycine, présent dans toutes nos cellules, dont la synthèse est limitée par la disponibilité en cystéine — d'où le lien constant avec la NAC. Une précision utile, en revanche : le glutathion pris directement par voie orale est en grande partie dégradé dans le tube digestif, ce qui est un argument de biodisponibilité, pas une preuve qu'un autre produit ferait mieux.
Quelle différence avec la cystéine ou la cystine ?
Les trois sont apparentées. La cystéine est l'acide aminé de base, présent dans les protéines alimentaires ; instable, elle s'oxyde vite. La cystine est le dimère formé par deux cystéines liées par un pont disulfure, plus stable mais bien moins soluble. La N-acétyl-L-cystéine porte un groupement acétyle qui la stabilise tout en la gardant soluble. Trois formes d'une même famille, retenues pour des raisons de formulation.
Comment et quand prendre la NAC ?
Suivez le mode d'emploi du fabricant : c'est la seule réponse défendable en l'absence de posologie de référence pour un usage alimentaire. La prise en dehors des repas est fréquemment recommandée, mais elle expose davantage aux nausées et aux brûlures ; si l'estomac proteste, la prise au cours d'un repas règle généralement le problème. Avalez la gélule avec un grand verre d'eau, ne compensez jamais une gêne digestive par une augmentation de dose, et ne cumulez pas deux produits contenant la même substance. Si vous prenez un traitement — dérivés nitrés, anticoagulant, antiagrégant — ou si vous êtes asthmatique, la question du « quand » passe après celle du « faut-il », et celle-là se pose à un médecin.
Peut-on l'associer à d'autres compléments ?
Techniquement rien ne s'y oppose, et beaucoup de formules du marché sont déjà des complexes. Deux réserves. La première est comptable : additionnez les doses de tous vos produits, car les complexes multi-ingrédients rendent les cumuls faciles à manquer. La seconde tient aux interactions décrites plus haut. Si vous prenez un traitement, la question relève de votre pharmacien ou de votre médecin, pas d'une page produit.
Y a-t-il un intérêt en musculation ?
Rien ne permet de l'affirmer, et nous ne la présentons pas comme une aide à la performance : aucune allégation n'est autorisée sur la force, l'endurance ou la récupération. Les produits dont l'effet sur l'entraînement est réellement documenté sont ailleurs — la créatine monohydrate en premier lieu, les protéines pour couvrir les besoins, la bêta-alanine sur certains formats d'effort. Notre guide de nutrition sportive les hiérarchise.
Où trouver de la N-acétylcystéine ?
Deux circuits, et il ne faut pas les confondre. En pharmacie, sous forme de médicament mucolytique, avec une notice et un pharmacien pour vous conseiller. En complément alimentaire, sur cette page — avec expédition partout en France et en Europe — ou dans notre boutique de Vendargues, à dix minutes de Montpellier, avec retrait sous 2 heures. Sur ce produit plus que sur d'autres, nous commencerons par vous demander si vous suivez un traitement et si vous êtes asthmatique : selon la réponse, nous vous renverrons vers votre pharmacien plutôt que de vous vendre quoi que ce soit.
