NMN (Nicotinamide Mononucleotide)

supporting cellular NAD+ levels

supplement

Meta-analysis availableHuman trial evidenceNeeds more research

NAD+ precursor studied for cellular aging and energy metabolism.

Nicotinamide Mononucleotide (NMN) is a naturally occurring compound that serves as a precursor to nicotinamide adenine dinucleotide (NAD+), a coenzyme vital for numerous cellular processes. These processes include energy metabolism, DNA repair, and gene expression. NMN is found in small amounts in various foods like broccoli, cabbage, avocado, and tomatoes. Interest in NMN has grown due to its potential role in supporting cellular health and its association with NAD+ levels, which naturally decline with age. Research into NMN is ongoing, primarily focusing on its effects in animal models and early human studies.

Quick answer

What it is: Nicotinamide Mononucleotide (NMN) is a naturally occurring compound that serves as a precursor to nicotinamide adenine dinucleotide (NAD+), a coenzyme vital for numerous cellular processes.

Evidence Summary

The current understanding of NMN's effects is largely based on preclinical studies, primarily in animal models. While these studies have shown promising results in various areas, human clinical trials are still in early stages and are limited in number and scope. Therefore, strong evidence for specific health benefits in humans is not yet established.

Last reviewed · Jun 2026

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Why It Works

Converts to NAD+ via NMNAT enzymes.

How it works in more detail

NMN enters cells and is converted to NAD+ through a salvage pathway. Specifically, NMN is phosphorylated by NMN adenylyltransferase (NMNAT) enzymes to form NAD+. NAD+ is a critical coenzyme for various enzymatic reactions, including those catalyzed by sirtuins (SIRT1-7), which play roles in aging, metabolism, and inflammation, and poly(ADP-ribose) polymerases (PARPs), which are involved in DNA repair and genomic stability. By increasing NAD+ levels, NMN may indirectly influence these pathways, potentially supporting cellular resilience and metabolic function.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage

250–500 mg/day

Typical forms

capsule, powder

Quality markers

Look for products that provide third-party testing for purity and potency. Reputable manufacturers often provide certificates of analysis (COAs) to verify the NMN content and absence of contaminants. Choose products from established brands with good manufacturing practices (GMP) certification.

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Suggested dosage

250–500 mg/day

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Nicotinamide Mononucleotide (NMN)

Safety

Safety warnings

Long-term safety still under study.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade

Meta-Analyses(1)

Pooled analyses across multiple human trials.

Very High Quality

Effects of Nicotinamide Mononucleotide on Glucose and Lipid Metabolism in Adults: A Systematic Review and Meta-analysis of Randomised Controlled Trials.
Chen F, Zhou D, Kong AP, Yim NT, Dai S, Chen YN · Current diabetes reports · 2024
Supplementation of nicotinamide mononucleotides (NMN) has been claimed to improve metabolic function. We reviewed human randomised controlled trials (RCTs) of NMN to evaluate its effect on markers of glucose and lipid metabolism. Eight RCTs on NMN (dosage ranged 250-2000 mg/d for a duration of 14 days to 12 weeks) involving a total of 342 middle-age/older adults (49% females, mainly non-diabetic) reporting at least one outcome on glucose control or lipid profile published in 2021-2023 were reviewed. The random-effects meta-analyses indicated no significant benefit of NMN on fasting glucose, fasting insulin, glycated hemoglobin, homeostatic model assessment for insulin resistance and lipid profile. Based on the small number of RCTs involving mainly relatively healthy adults, short-term supplementation of NMN of 250-2000 mg/d did not show significantly positive impacts on glucose control and lipid profile.
Meta-AnalysisPubMedVery High Quality

Limitations: A significant limitation is the lack of extensive, large-scale, long-term human clinical trials. Most existing human studies are small, short-duration, and often focus on safety and pharmacokinetics rather than robust clinical outcomes. The extrapolation of findings from animal models to humans is also a key limitation.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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