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Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
Definition
Nicotinamide mononucleotide, in plain English
NMN is a nucleotide made of nicotinamide, a ribose sugar and a phosphate. In the salvage pathway, the enzyme NAMPT makes NMN from nicotinamide, and NMNAT enzymes then convert NMN to NAD+.
NMN is sold mainly as an oral product. In 2022 the FDA said NMN couldn't be sold as a dietary supplement; in September 2025 it reversed that view after a citizen petition.
- Short name
- NMN
- Made by
- NAMPT, from nicotinamide
- Becomes
- NAD+ (via NMNAT)
How it connects
How nicotinamide mononucleotide relates to NAD+
A 2021 trial in women with prediabetes found that 10 weeks of NMN increased muscle insulin sensitivity by about 25%, according to an NIH summary of the study (Yoshino et al., Science).
For your treatment
What nicotinamide mononucleotide means for NAD+ therapy
NMN is mostly taken by mouth, while NADMedics prescribes NAD+ itself. Your provider can talk through how the options differ; none is proven to slow aging.
- Free online consultation with a licensed U.S. provider
- NAD+ nasal spray or injection, plans from $166 a month if prescribed
- NAD+ has no FDA-approved use; compounded NAD+ isn’t FDA-approved
Questions
Nicotinamide mononucleotide: common questions
What is nicotinamide mononucleotide?
Nicotinamide mononucleotide (NMN) is the molecule one step before NAD+. The body makes it from nicotinamide or NR, and it's studied, and sold, as a way to raise NAD+.
Is NMN the same as NAD+?
No. NMN is the direct precursor; one enzyme step turns it into NAD+.
Does NMN work?
Small human trials show it can raise NAD+ markers, and one found better muscle insulin sensitivity in women with prediabetes. There's no proof it slows aging.
Can I take precursors with NAD+ therapy?
Combining them hasn't been studied. Tell your provider about any NR, NMN, niacin or other supplements before you start.
Can I get enough NAD+ from food?
Food supplies niacin and tryptophan, which your body turns into NAD+, and NIH says most people in the U.S. get enough niacin. NAD+ in food is largely broken down during digestion.
Do precursors and NAD+ therapy do the same thing?
Both aim to raise NAD+, by different routes: precursors are converted by the body, while spray and injections deliver NAD+ itself. They haven't been compared in trials.
Keep learning
Related NAD+ terms
Terms that connect to nicotinamide mononucleotide, each explained on its own page.
- Vitamins & precursorsNicotinamide ribosideNicotinamide riboside (NR) is a form of vitamin B3 sold as a dietary supplement. The body converts it to NMN and then to NAD+, and small human trials show it can raise NAD+ levels.
- Enzymes & pathwaysNAMPTNAMPT (nicotinamide phosphoribosyltransferase) is the enzyme that turns nicotinamide into NMN. It's the rate-limiting step of the salvage pathway that recycles NAD+.
- Enzymes & pathwaysNAD+ salvage pathwayThe NAD+ salvage pathway recycles nicotinamide, which is released whenever enzymes use NAD+, back into NAD+. It's the main way most human cells keep their NAD+ supply topped up.
- Vitamins & precursorsNAD+ precursorAn NAD+ precursor is any molecule the body can turn into NAD+. The main ones are tryptophan, nicotinic acid, nicotinamide, nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN).
Guides that cover nicotinamide mononucleotide
- What Is NAD Injections? A Simple, Friendly Beginner's GuideNew to NAD+ injections? Learn what they are, how a shot under the skin works, what research shows, who should skip them and what they cost at NADMedics.NAD+ injections
- How Much NAD+ Should I Inject? Dosage Made Simple for YouHow much NAD+ should you inject? There's no FDA-approved dose, so your provider sets it. Learn what shapes that dose, what studies used and how to measure it.NAD+ injections
- How Long Should You Take NAD+ Injections? A Usage Guide NowHow long should you take NAD+ injections? There's no long-term data, so plans are reviewed regularly. Learn when to reassess, pause or stop with your provider.NAD+ injections
Official sources
Nicotinamide mononucleotide: sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- NIH Office of Dietary SupplementsNiacin: Health Professional Fact Sheet
Explains how the body turns niacin (vitamin B3) into NAD, a coenzyme used by more than 400 enzymes.
- NIH PubMedYoshino et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women (2021)
10-week randomized trial of oral NMN.
- National Institutes of HealthSupplement improves glucose metabolism in women's muscle
NIH summary of the 2021 NMN trial in women with prediabetes.
- NIH National Center for Biotechnology InformationNAMPT nicotinamide phosphoribosyltransferase [human] (NCBI Gene)
Gene record for NAMPT, the enzyme that turns nicotinamide into NMN.
- U.S. Food and Drug Administration (Regulations.gov)FDA response to citizen petition on NMN, docket FDA-2023-P-0872 (2025)
FDA concluded NMN is not excluded from the definition of a dietary supplement.
Medically reviewed by Dr. Vanessa Niles, R.N., M.D., F.A.C.O.G., on October 12, 2026. This glossary is general education, not medical advice. NAD+ has no FDA-approved use, and compounded NAD+ is not FDA-approved or evaluated by the FDA for safety or effectiveness. Talk with a licensed provider before starting any supplement or treatment.
Questions about NAD+? Ask a provider
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