Few topics in supplements attract as much confident language as NAD+. Search for it and you will find claims about cellular energy, ageing, metabolism and repair, delivered with a certainty that the underlying human research does not currently support. The molecule is genuinely important in biology, and the leap from that to what a capsule will do for a person is where most of the marketing lives.
We sell a NAD+ precursor product, so we have an obvious interest here, and the most useful thing we can do is set out the position honestly: what NAD+ is, how the precursors differ, what human trials have looked at, why no UK product is allowed to make a health claim about any of it, and why one of our own formulas is not on sale.
What NAD+ actually is
Nicotinamide adenine dinucleotide, written NAD+ in its oxidised form, is a coenzyme present in every cell in your body. It shuttles electrons in the reactions that release energy from food, and it is a substrate for several families of enzymes involved in cellular signalling and DNA repair.
None of that is contested. It is standard biochemistry and it has been in textbooks for decades. What has changed over the past fifteen years is the volume of research into whether NAD+ availability declines with age in various tissues, and whether raising it through supplementation changes anything that matters to a person.
That second question is where the interesting work is happening and where the honest answer is still incomplete. Being clear about the boundary between the two is most of what separates a careful discussion of NAD+ from a sales page.
Why precursors rather than NAD+ itself
Products in this category rarely contain NAD+. They contain precursors, which are compounds the body converts into NAD+ through established pathways. The reasoning usually given is that the NAD+ molecule itself is poorly suited to oral supplementation, so a precursor is the practical route.
Several precursors exist. Nicotinic acid and nicotinamide are forms of vitamin B3 and have been in the food supply for a very long time. Nicotinamide riboside, usually shortened to NR, and nicotinamide mononucleotide, NMN, are the two newer compounds that the modern category is built on.
Our NAD+ Precursor Complex supplies 300 mg of NR as nicotinamide riboside chloride, alongside 300 mg of TMG, per one-capsule serving. It is a deliberately short formula, and there is a reason for that which the next article covers in more detail: a two-ingredient panel is far easier to compare against another product than a fourteen-ingredient one.
NR, NMN and niacin: how the precursors differ
Niacin, vitamin B3, is the long-established route. It has authorised health claims as a vitamin, it has an NRV, and at high doses it is associated with flushing. Our multivitamin contains 20 mg of niacin as niacinamide.
NR is the precursor with the larger body of published human safety and pharmacokinetic data, and it is available as a food supplement ingredient in Great Britain.
NMN sits one step further along the pathway. It attracts a great deal of interest, and its regulatory status in Great Britain is not settled in the way it is for vitamins and minerals.
Arguments about which precursor is superior are common online and largely outrun the human evidence. Differences in how each is absorbed and converted are real research questions; they are not settled enough to justify the confidence with which they are often asserted.
What human trials have and have not shown
A reasonable summary of the published human work on NR goes roughly like this. Trials have repeatedly shown that oral NR raises measurable NAD+ markers in blood, in a dose-related way. Studies to date have generally reported it as well tolerated over the periods examined.
Those are meaningful findings and they are also narrower than the marketing implies. Raising a blood marker is a biochemical result; it is not the same as demonstrating a clinical benefit. Trials in humans have generally involved modest numbers of participants over relatively short periods, and results on functional outcomes have been mixed.
The honest position is that this is an active research area with promising biochemistry and an incomplete clinical picture. Anyone telling you otherwise, in either direction, is going beyond the data. If you want to look at it yourself, the exact form and amount are on our panel precisely so that you can compare it against what the studies used.
Why our NMN product is not on sale
We hold stock of a formula called NMN 500 + Apigenin Advanced, its panel is published on our Ingredients page, and it is not available to buy. That deserves an explanation rather than a quiet out-of-stock label.
The regulatory position of NMN as a food supplement ingredient in Great Britain is not resolved in the way it is for an established vitamin. Where a question like that is open, a business has a choice: sell while the position is unclear, or withhold the product until it is not. We chose to withhold it.
We have kept the panel published anyway, for two reasons. Existing customers should be able to look up what they took, and anyone comparing our range should be able to see the whole of it rather than the convenient parts. If you would like to be told when the position changes, contact us and we will keep a note.
TMG and the methylation argument
Our formula pairs NR with 300 mg of TMG, trimethylglycine, also called betaine. The rationale usually offered is that metabolising nicotinamide compounds consumes methyl groups, and that supplying a methyl donor alongside the precursor addresses that.
The mechanism is plausible and it is discussed in the literature. It is not settled that supplementation is necessary at typical intakes, and it should be presented as a reasoned formulation decision rather than an established requirement.
There is a regulatory detail here that is worth being precise about, because it is the kind of thing that is easy to blur. An authorised UK health claim does exist for betaine and normal homocysteine metabolism — but it applies only at a daily intake of 1.5 g. This formula supplies 300 mg, which is one fifth of that. The claim therefore does not apply to this product, we do not make it, and it should not be inferred. We would rather point that out ourselves than leave you to find it.
Why no NAD+ product carries a health claim
Health claims in Great Britain must be on the authorised register and used in the approved wording. There is no authorised claim for nicotinamide riboside, and none for NMN. That is not a temporary gap awaiting paperwork; it means no UK seller may lawfully tell you what these ingredients will do for you.
Watch how the category works around that. Vague phrasing about cellular energy, healthy ageing or vitality does the job of a claim while trying to avoid the form of one. Testimonials, mouse studies quoted as though they were human trials, and pointed references to prominent researchers are all doing similar work.
Our claims row for this product reads none, and that is the accurate entry. What we can do is publish the form, the amount, the excipients and the cautions, and let you assess it against the literature yourself.
Reading a NAD+ product page critically
If you are considering anything in this category, from us or anyone else, these questions separate substance from atmosphere.
- Which precursor, in which form, at what amount per daily serving? NR as nicotinamide riboside chloride at 300 mg is a checkable statement.
- Is the evidence cited human? A great deal of NAD+ research is in cells and mice. That work is legitimate and it is not about you.
- Are outcomes being promised? If so, the seller is outside the rules.
- Is there a blend hiding the amounts?
- Are the cautions and the other ingredients published?
- What does the price work out at per day? This is an expensive category and the arithmetic varies enormously.
And the general principle that applies to any new supplement: introduce one at a time, so anything you notice can be attributed to something.
Frequently asked questions
Is NMN available to buy in the UK?
Its status as a food supplement ingredient in Great Britain is not settled in the way it is for established vitamins and minerals. We have chosen to withhold our own NMN formula from sale while that position is reviewed, rather than sell it with an open question attached. Its panel stays published on our Ingredients page for transparency.
What is the difference between NR and NMN?
Both are precursors the body can convert towards NAD+, sitting at different points on the same pathway. NR has the larger published human dataset and is available as a supplement ingredient in Great Britain; NMN's regulatory position here is unresolved. Claims that one is definitively superior run ahead of the human evidence.
Do NAD+ supplements slow ageing?
No UK supplement may make that claim, and we do not. Human trials have shown that NR can raise measurable NAD+ markers in blood; demonstrating a clinical benefit is a different and much harder question, and the human evidence there is limited and mixed. Much of the striking research in this field is in cells and animals.
Do you need to take TMG with NR?
It is a reasoned formulation choice rather than an established requirement. The argument is that metabolising nicotinamide compounds uses methyl groups and a methyl donor offsets that; the mechanism is discussed in the literature but it is not settled that supplementation is needed at typical intakes. Our formula includes 300 mg of TMG, and we make no health claim for it.
Before choosing a supplement
- Read the complete current label, including the active and the other ingredients.
- Compare the daily serving rather than the number printed on the front of the bottle.
- Add up every source of the same nutrient across your whole routine.
- Ask a pharmacist or qualified healthcare professional about medicines, pregnancy, breastfeeding, surgery or an existing condition.
- Remember that food supplements do not replace a varied, balanced diet and a healthy lifestyle.
Related guides on this formula
- How to compare cellular energy and NAD+ supplement labels
- Healthy ageing: what supplements can and cannot say
View the NAD+ Precursor Complex label, the full ingredient panel and current purchase options.
Also useful: RevaHealth Journal · full range · Ingredients · Contact.
References and further reading
- GOV.UK: Great Britain nutrition and health claims register
- Food Standards Agency: Regulated products, including novel foods
- NHS: B vitamins, including niacin
This article is general educational information, not medical advice. Food supplements are not medicines and are not intended to diagnose, treat, cure or prevent disease. Always read the complete physical label before use, and speak to your GP or pharmacist if you are unsure whether a supplement is right for you.
