NMN vs NMNH
Written by Aaron CuhaReviewed Sep 2026
The short answer
NMN and its reduced form, which raises NAD faster and higher in cells and mouse tissue. In the same lab tests, NMNH slowed the cell's sugar burning and energy cycle, stopped cells dividing, and held back cell growth in a dish. No human has been given it in a published trial.
- NMN people
- 94
- NMN nulls
- 3
- NMNH people
- 0
- NMNH nulls
- 0
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.
1 completed trial, 0 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
NMNHReduced nicotinamide mononucleotide, dihydronicotinamide mononucleotide
Raises NAD in cells and mouse tissue faster and higher than NMN, by a route that skips two slow enzyme steps. In the same experiments it slowed the cell's main sugar-burning steps, stopped cells dividing and held back cell growth in a dish. No person has been given it in a published study.
Side by side, on the facts we can check
| What we compare | NMN | NMNH |
|---|---|---|
| Category | Longevity | Longevity |
| FDA status | Not an approved drug; whether it can be sold as a US supplement is disputed | Not an approved drug, and not a recognised supplement ingredient in the United States. NMN has a long and disputed legal history. NMNH has none, because the FDA has never made any ruling about it. |
| Half-life | Short | No human pharmacokinetic study has been published, so no half-life in people can be stated. In mice the whole-blood NAD rise was described as rapid and sustained, which is a downstream metabolite measurement rather than clearance of the compound. |
| Molecular weight | 334.2 Da | The reduced, dihydro form of nicotinamide mononucleotide, which is 334.2 Da in its oxidised form. |
| 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. | Enzymes turn NMNH straight into NADH, which joins the NAD pool. That skips NAMPT, the slow recycling enzyme that nicotinamide depends on. It also skips the NRK enzymes that NR depends on. That is why it beats both in cells. NMNH is also what NRH turns into, so the two reduced forms meet at the same point. Because it comes in as the reduced form, it raises NADH as well as NAD, and shifts the balance between them. That is the likely reason it slowed the cell's sugar-burning steps, since that balance helps control them. |
| Studies in people | 4 | 1 |
| Evidence | Limited: 4 completed trials, 94 people given it | Limited: 1 completed trial, none stating how many people |
| Legal status, US | Not approved; in 2022 the FDA decided it does not count as a supplement | Not approved; research use only |
Frequently asked questions
What is the difference between NMN and NMNH?
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. NMNH: Raises NAD in cells and mouse tissue faster and higher than NMN, by a route that skips two slow enzyme steps. In the same experiments it slowed the cell's main sugar-burning steps, stopped cells dividing and held back cell growth in a dish. No person has been given it in a published study.
Which has stronger research evidence, NMN or NMNH?
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). NMNH is Limited (1 completed trial, none stating how many people). 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 NMNH FDA-approved?
NMN: Not an approved drug; whether it can be sold as a US supplement is disputed. NMNH: Not an approved drug, and not a recognised supplement ingredient in the United States. NMN has a long and disputed legal history. NMNH has none, because the FDA has never made any ruling about it..
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- Metabolic / Sep 27, 2026 / 7 minSLU-PP-332 and 5-Amino-1MQ: Two 'Peptides' That Are Not Peptides, and What the Mouse Data Actually Show
- 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.