NMN vs Nicotinamide
Written by Aaron CuhaReviewed Sep 2026
The short answer
A building block sold for ageing, against a cheap B3 form with a real large final stage result, in skin cancer prevention rather than ageing. Nicotinamide cut new skin cancers, not counting melanoma, by 23 percent over 12 months. The benefit stopped when the tablets stopped.
- NMN people
- 94
- NMN nulls
- 3
- Nicotinamide people
- 591
- Nicotinamide nulls
- 4
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
4 completed trials, 94 people given it
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
4 completed trials, 591 people given it
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
NMNNicotinamide Mononucleotide
A pill the body turns into NAD+. It is studied for blood sugar and strength in ageing. Early studies in people show small results, and whether it can be sold as a US supplement is disputed.
Column B
NicotinamideNicotinamide, the amide form of vitamin B3
A plain form of vitamin B3. In a large final-stage study of 386 people at high risk, 500 mg twice a day cut new skin cancers other than melanoma by 23 percent over 12 months. The benefit stopped once the pills stopped. The same study in 158 organ transplant patients found nothing. No study has ever tested it against ageing.
Side by side, on the facts we can check
| What we compare | NMN | Nicotinamide |
|---|---|---|
| Category | Longevity | Longevity |
| FDA status | Not an approved drug; whether it can be sold as a US supplement is disputed | Not an approved drug for preventing skin cancer in the United States. It is a standard form of the vitamin niacin. It is sold over the counter and found in multivitamins and skin care products. The dose used in the ONTRAC study is an over-the-counter dose, used off label, meaning outside any approved use. |
| Half-life | Short | About 4 hours in plasma, which is why the skin cancer trials dosed it twice a day rather than once. |
| Molecular weight | 334.2 Da | 122.1 Da |
| How it works | The body turns it into NAD+ through a recycling route called the salvage pathway. The aim is to bring back NAD+ levels that fall with age. | Nicotinamide is turned back into NAD by the recycling route. First an enzyme called NAMPT turns it into NMN. Then other enzymes turn NMN into NAD. NAMPT is the slow step. So more nicotinamide does not mean more NAD in a straight line. The bottleneck is the enzyme, not the supply. Separately, nicotinamide is what is left when sirtuins, PARPs and CD38 use up NAD. It then blocks sirtuins by sitting in a pocket next to where NAD binds, which switches the enzyme away from its normal job. In skin, the cancer-prevention effect works a different way again and does not depend on NAD in the blood at all. Nicotinamide helps repair DNA damaged by sunlight, and it eases the way sunlight weakens the skin's immune defence. |
| Studies in people | 4 | 4 |
| Evidence | Limited: 4 completed trials, 94 people given it | Moderate: 4 completed trials, 591 people given it |
| Legal status, US | Not approved; in 2022 the FDA decided it does not count as a supplement | Sold as a supplement |
Frequently asked questions
What is the difference between NMN and Nicotinamide?
NMN: A pill the body turns into NAD+. It is studied for blood sugar and strength in ageing. Early studies in people show small results, and whether it can be sold as a US supplement is disputed. Nicotinamide: A plain form of vitamin B3. In a large final-stage study of 386 people at high risk, 500 mg twice a day cut new skin cancers other than melanoma by 23 percent over 12 months. The benefit stopped once the pills stopped. The same study in 158 organ transplant patients found nothing. No study has ever tested it against ageing.
Which has stronger research evidence, NMN or Nicotinamide?
Each compound gets a band worked out from facts we counted, with the math shown. NMN is Limited (4 completed trials, 94 people given it). Nicotinamide is Moderate (4 completed trials, 591 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are NMN and Nicotinamide FDA-approved?
NMN: Not an approved drug; whether it can be sold as a US supplement is disputed. Nicotinamide: Not an approved drug for preventing skin cancer in the United States. It is a standard form of the vitamin niacin. It is sold over the counter and found in multivitamins and skin care products. The dose used in the ONTRAC study is an over-the-counter dose, used off label, meaning outside any approved use..
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- Longevity / Sep 27, 2026 / 8 minNMN vs NR vs NAD+: The 2026 Head-to-Head Human Trials, and Who Funded the Comparisons
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.