NMN is a building block your body turns into NAD+
NAD+ is a coenzyme that cells use in energy metabolism, and the repair enzyme PARP and the sirtuin family of enzymes depend on it (Massudi et al., PLoS One 2012). NMN is a precursor, a raw material the body converts into NAD+. Inside cells it is one enzyme step away, and nicotinamide riboside (NR) goes through NMN first (Yoshino, Baur and Imai, Cell Metabolism 2018).
In human skin, NAD+ falls with age. Across 49 samples from people aged 0 to 77, it declined as age rose in both men and women (Massudi et al.). That is why researchers study NAD+ precursors such as NMN.
NMN also occurs in food, in small amounts. A 2016 analysis measured 0.25 to 1.88mg per 100g in edamame, broccoli, cucumber and cabbage, and 0.26 to 1.60mg in avocado and tomato (Mills et al., Cell Metabolism 2016). One 500mg capsule would take more than 26kg of edamame at its richest.
What 25 human trials have measured
25 published human trials of oral NMN, run from 2020 to 2026 with 884 participants, are in our NMN human trials dataset. By our count, the authors of 11 of them report higher blood NAD+ after NMN, including 8 randomised, placebo-controlled trials such as Yi et al., GeroScience 2023 and Christen et al., Nature Metabolism 2026.
| Measure | Value |
|---|---|
| Published human trials | 25, from 2020 to 2026 |
| Participants enrolled | 884 including placebo arms, median 30 per trial |
| Design | 17 randomised, 17 placebo-controlled |
| Daily dose tested | Median highest dose 300mg, range 100 to 2,000mg |
| Length | Median 8.3 weeks, longest 24 weeks |
| Authors report higher blood NAD+ | 11 trials (8 randomised and placebo-controlled), our count |
Higher blood NAD+ suggests the NMN was absorbed and used. It does not by itself show a health benefit, and the other outcomes are mixed: a 24-week trial in 14 older men found no improvement in grip strength or walking speed against placebo (Akasaka et al. 2023), and a 60-person trial found no difference on its primary stepping test (Morifuji et al. 2024). Several trials were funded or supplied by NMN makers, which the dataset records. For what people take NMN for and what the research looked at, see NMN benefits.
NMN comes as capsules, powder, sublingual powder and liposomal capsules
24 of the 25 human trials gave NMN by mouth, and the other compared swallowing with sublingual dosing.
| Form | What you get | Human evidence | Practical point |
|---|---|---|---|
| Capsules | A fixed dose per capsule (500mg in Pure NMN Pro) | 24 of 25 trials gave NMN by mouth | Check mg per capsule on the label |
| Powder | Loose NMN you measure each day | No trial in our dataset compares it with capsules | Needs a scale or scoop |
| Sublingual powder | Powder held under the tongue | One crossover trial (14 men): blood NAD+ matched swallowed NMN over 60 minutes | You still measure each dose |
| Liposomal capsules | NMN wrapped in fat-based spheres | No human trial against plain NMN found (PubMed, 24 October 2026) | 125 to 250mg of NMN per capsule in our index |
For the cost side, see NMN powder vs capsules: cost. For the evidence on liposomal and sublingual forms, see Is liposomal NMN worth it?
NMN, NR and NAD+ are three different things
NAD+ is the molecule cells use, and NMN and nicotinamide riboside (NR) are two precursors the body can turn into it. In a 2026 trial that compared them directly, 14 days of NMN or NR raised blood NAD+ by a comparable amount (Christen et al., Nature Metabolism). NAD+ itself is sold as capsules and IV drips, and a drip costs £250 to £449 a session (checked 11 October 2026). NR has a GB novel food authorisation and NMN does not yet. NMN vs NR vs NAD+ drips compares cost, trials and legal status side by side.
NMN has no Great Britain novel food authorisation yet
NMN has no GB novel food authorisation yet. The application, RP-2116, is at risk assessment with the Food Standards Agency. NMN is sold by many UK brands, 43 of them in our price index. Our guide to NMN and UK novel food rules explains what that means for buyers.
How to choose a good NMN supplement: five checks
| Check | What good looks like | Why it matters |
|---|---|---|
| Ingredients | NMN and the capsule shell, nothing else | Added powders take room that NMN could fill |
| Dose per capsule | mg of NMN per capsule stated, one capsule per serving | A 1,000mg serving can be four 250mg capsules |
| Form and purity | Beta-NMN with a stated purity, such as 99% or more | You can check the figure against a batch certificate |
| Batch testing | An independent lab's Certificate of Analysis for your batch, with batch number and test date | A certificate covers one batch, so old or undated ones say little |
| Price per gram | Pack price divided by grams of NMN in the pack | A pack price alone hides how much NMN is inside |
A worked example: a pack of 90 capsules at 500mg holds 45g of NMN, so £27.99 is £0.62 a gram. A pack of 60 capsules at 125mg holds 7.5g, so £50 is £6.67 a gram.
RGENR8 Pure NMN Pro is 500mg of beta-NMN per capsule at no less than 99% purity, in a vegan HPMC shell with no fillers or binders. It is made to GMP-equivalent standards, and every batch is tested by an independent accredited lab, with a Certificate of Analysis on request. Full guides: How to check NMN purity: a COA checklist and NMN with no fillers in the UK.
What NMN costs in the UK
RGENR8 Pure NMN Pro is £27.99 for 90 capsules on your first 3-month order with code WELCOME20 (the 3-month checkout applies it automatically), which is 31p a day and £0.62 a gram. After that it is £34.99 every 3 months. A single bottle of 30 capsules is £24.95, and the one-off 3-pack is £34.99. UK delivery is free, and unopened bottles have a 14-day money-back guarantee.
The first-order price is the lowest first-order price per gram for 500mg capsule packs under 1,000 capsules in our UK NMN Price Index (107 products from 44 brands, median plain capsule £1.50 a gram, prices checked 10 October 2026). See the UK NMN Price Index data or Best NMN supplement UK 2026: the main brands compared.
Common questions
What is NMN?
NMN is nicotinamide mononucleotide, a molecule your body uses to make NAD+, a coenzyme involved in cellular energy. It occurs in small amounts in foods such as edamame and avocado and is sold as a supplement. RGENR8 Pure NMN Pro is a single-ingredient 500mg capsule.
What does NMN do?
In the body, NMN is converted into NAD+, which cells use in energy metabolism. In our dataset of 25 human trials, the authors of 11 report higher blood NAD+ after NMN. The Pure NMN Pro label says: "Supports healthy cell function and may support overall vitality and well-being."
Is NMN natural?
NMN occurs naturally in the body and in small amounts in some foods, up to 1.88mg per 100g in edamame in a 2016 analysis. A capsule holds 500mg, so food cannot match it. Capsule NMN is manufactured rather than extracted from vegetables.
Is NMN the same as NAD+?
No. NAD+ is the coenzyme your cells use. NMN is a precursor, a raw material the body converts into NAD+. Nicotinamide riboside (NR) is another precursor. In a 2026 trial, 14 days of NMN or NR raised blood NAD+ by a comparable amount.
Is NMN legal in the UK?
NMN has no GB novel food authorisation yet. The application, RP-2116, is at risk assessment with the Food Standards Agency, and you can follow it on the FSA register. Many UK brands sell NMN.
MNM or NMN: which is right?
NMN is right. It stands for nicotinamide mononucleotide: N for nicotinamide, M for mono and N for nucleotide. MNM is a common typo with the first two letters swapped.
If you are pregnant, breastfeeding, taking medication or managing a health condition, check with your GP or pharmacist before taking any supplement.
Ready to try it? Shop Pure NMN Pro.
