NMN is nicotinamide mononucleotide, a naturally occurring molecule the body uses to produce NAD+, a coenzyme involved in energy metabolism and many other cellular processes.

It is found in small amounts in foods, and supplements supply it in much larger amounts.

NMN is a precursor, and NAD+ is the coenzyme that does the work inside cells. The body converts NMN into NAD+.

NAD+ supplements exist too, but they are a different product with their own regulatory and evidence questions.

Both are NAD+ precursors that the body can convert into NAD+, but they are different molecules with different routes into the cell.

Trials exist for both, and we are not aware of evidence showing that one clearly outperforms the other on health outcomes.

People take NMN because NAD-related metabolism changes with age, and they are interested in supporting it.

No health claim for NMN is authorised in the UK, and human trials show a reliable rise in blood NAD markers but much less consistent effects on health outcomes.

Yes. Several human trials have reported increases in blood NAD-related measurements after oral NMN.

Evidence for broader health benefits is much less consistent, and most trials have lasted weeks or months.

The best choice depends on what matters to you. Our overall pick is Charava NMN 500mg, because it delivers 500mg in a single capsule with stated 99.8% purity, third-party testing and a one-ingredient vegan formula.

For a fast-dissolve tablet, look at Renue. For a high dose, Neurogan. For a lower-cost modest dose stocked in the UK, Double Wood.

Look for a clearly stated dose, disclosed purity, independent testing, a transparent ingredient list, appropriate manufacturing standards and claims that match the evidence.

Also check how many capsules or tablets make up a serving, because that changes both convenience and cost.

No. Dose is one factor among several, and purity, testing, transparency and formulation matter just as much.

Human trials have used between 250mg and 900mg a day, and no study has shown that a higher dose is better for everyone.

Not proven. One small study found a larger rise in blood NAD+ with a liposomal formulation, but it involved only five people per group.

Larger independent studies are needed, and the biggest body of human research used conventional capsules.

There is no clear evidence that it is. Dissolving NMN under the tongue is a matter of preference, and we are not aware of trials showing better health outcomes than capsules.

Tablets suit people who dislike swallowing capsules, and capsules suit people who dislike the taste.

Not necessarily. Formulas that add quercetin, piperine or other ingredients are harder to compare, and it is harder to know which component is doing what.

If your goal is simply to take NMN, a single-ingredient product is easier to judge.

At the time of writing, Charava NMN 500mg is £44.99 for 30 capsules (£85.49 for 60 days and £121.49 for 90 days), and Double Wood NMN 250mg is about £28 for 60 capsules at Healf.

Compare the cost per milligram as well as per month: Charava costs less per milligram of NMN than Double Wood, because its capsule has twice the dose. US brands may add delivery and import costs.

No optimal dose has been established. Human trials have used between 250mg and 900mg a day, with higher amounts tested in short safety studies.

Follow the directions on the product you choose, and do not exceed the amount it advises.

No. It sits in the middle of the range used in human research, between the 250mg and 900mg doses tested in published trials.

That makes it a practical middle ground rather than a headline number.

There is no good evidence that timing matters. Morning is the most common choice, and Charava's guidance is one capsule in the morning.

The best time is whenever you will remember it every day.

Trials measured changes in blood NAD levels over weeks, not how people felt. Do not expect a quick effect.

Responses vary between people, and some people notice nothing. Take it consistently if you want to judge it fairly.

Directions differ between brands. Charava suggests taking it with water in the morning, and Double Wood suggests taking it with food.

Follow the instructions on the product you buy, and take it with food if it upsets your stomach.

NMN is often taken alongside other supplements, but there is little trial data on combinations. We are not aware of well-established interactions.

If you take prescribed medication or have a health condition, check with your pharmacist or GP first.

Yes. Oral NMN has repeatedly been shown to raise blood NAD or NAD-related markers in human trials.

That shows NMN is biologically active in humans. It does not by itself show a health benefit.

No. We are not aware of any human evidence that NMN reverses ageing or extends lifespan.

Be wary of products that promise to slow ageing or rejuvenate cells. The evidence does not go that far.

The evidence is mixed and unproven. Systematic reviews found NMN raised NAD-related biomarkers but reported much less consistent effects on clinically meaningful outcomes.

Some people report feeling a difference and others do not, so treat such claims as individual experience, not established benefit.

To our knowledge, no health claim for NMN is authorised in the UK.

That means products should not promise specific health benefits. Compare the dose, purity, testing and price instead.

Published short-term human studies have generally reported NMN to be well tolerated, including a four-week study at 1,250mg a day.

Long-term safety over years has not been established.

Speak to your GP or pharmacist first if you are pregnant or breastfeeding, under 18, taking prescribed medication, or being treated for a medical condition.

This applies to every NMN product, whatever the brand says.

There is not enough research to recommend NMN during pregnancy or breastfeeding.

Speak to your midwife, GP or pharmacist before using any supplement during this time.

NMN is being assessed as a novel food in Great Britain. The Food Standards Agency's register lists the application for β-nicotinamide mononucleotide (RP-2116) as in risk assessment, as at 20 October 2026.

Novel foods must be authorised before they can be marketed, so ask any seller how they are meeting that requirement.

NMN itself is made synthetically or by fermentation, so it does not need animal ingredients. The capsule matters: Charava uses a vegetable (hypromellose) capsule, and Neurogan uses a vegetable cellulose capsule.

Check the label of any other product for capsule and ingredient details.

Charava is one of two products here that deliver the full serving in a single capsule, and it pairs a 500mg dose with a stated 99.8% purity figure, a certificate of analysis, third-party testing and a one-ingredient vegan formula.

It is not the cheapest per month, and the trials used other NMN products.

We may earn a commission when you buy through links on this page. This doesn't affect how we rank products: every product is assessed with the same method.

We explain our assessment criteria and state the trade-offs of every product, including Charava's, so you can make your own judgement.

We selected NMN supplements available to UK buyers that represent the main choices: a simple single-capsule product, a fast-dissolve tablet, a high-dose capsule, a lower-dose UK-stocked capsule and a combination formula.

Each was assessed on dose, purity, testing, formulation, manufacturing and ease of use, using manufacturer and retailer information available in October 2026.