Metformin
medicationA cheap, decades-old diabetes pill that some people ask about for weight and healthy aging.
12 providers
No. 011supplement
NMN
NMN is a supplement that is sold over the counter.
Also known as Nicotinamide mononucleotide, β-NMN, beta-NMN
NMN is a molecule the body converts into NAD+. It became popular through aging research in mice and is sold as a capsule or powder by supplement brands.
Is NMN FDA-approved?
Sold without a prescription. Supplements are not reviewed by the FDA before sale, so third-party testing matters. On September 29, 2025 FDA reversed its 2022 position and said NMN is not excluded from the dietary supplement definition. It is still a new dietary ingredient, so sellers must have a premarket notification on file for their ingredient.
As of September 23, 2026.
Key takeaways
- NMN is a building block your body uses to make NAD+. It is sold as a supplement.
- In September 2025, FDA said NMN can be sold as a dietary supplement again.
- Small trials show it raises NAD+ levels and is well tolerated in the short term.
- A 2025 meta-analysis found most health outcomes were no different from placebo, and warned its benefits may be exaggerated.
How does NMN work?
NMN (nicotinamide mononucleotide) sits one step before NAD+ in the body's production line. Taking it raises NAD+ levels in the blood.
The hope, based on mouse studies, is that restoring NAD+ improves metabolism and aging. Human trials so far are small and short, and mostly measure blood markers rather than health outcomes.
What does the evidence say about NMN?
Emerging evidenceSmall human trials show it raises NAD-related metabolites and is well tolerated in the short term; evidence for meaningful health or aging outcomes in people is limited.
What to expect
What trials and prescribing information measured over time. Everyone responds differently.
- 4 to 12 weeks
Human trials ran about 4 to 12 weeks and mostly measured changes in blood NAD+ and metabolic markers.
What do clinicians say about NMN?
Researchers see NMN as reasonably safe in the short term but still unproven for meaningful health or aging benefits.
In letters dated September 29, 2025, FDA said NMN is not excluded from the definition of a dietary supplement. Sellers still need a new dietary ingredient notification, and FDA did not evaluate safety.
Venable LLP: FDA declares nicotinamide mononucleotide is a dietary supplement (Oct 2025)A 2025 meta-analysis of 12 randomized trials found most clinically relevant outcomes did not differ from control, and cautioned that NMN's benefits may be exaggerated.
Oral NMN on glucose and lipid metabolism: meta-analysis of randomized trials (Crit Rev Food Sci Nutr 2025)A 2024 systematic review of 10 trials found NMN well tolerated with no serious adverse effects over trials of 4 to 12 weeks.
NMN and physical performance: systematic review of randomized trials (Cureus 2024)A 10-week trial found NMN improved muscle insulin sensitivity in women with prediabetes and overweight.
NMN increases muscle insulin sensitivity in prediabetic women (Science 2021)
Summaries of published guidelines, drug labels, regulators and reviews, each attributed to its source. DiscoverMedica does not employ clinicians.
Is NMN right for you, and who should avoid it?
Often considered for
- Adults interested in a supplement with early, limited evidence
- People who want to try an oral option before a compounded NAD+ prescription
Not a fit, or needs extra care
- Pregnancy or breastfeeding: it has not been studied
- Anyone with a current or past cancer should talk to their oncologist first
- People expecting proven anti-aging effects: long-term human data do not exist
Only a licensed clinician who knows your history can decide whether it is right for you.
What are the risks and side effects of NMN?
- Short-term human studies report few side effects, but long-term safety is not established.
- FDA does not test supplements before sale, so quality varies by brand; look for third-party testing.
- Not studied in pregnancy or breastfeeding.
- Animal findings on lifespan have not been shown in humans.
What should you ask a clinician about NMN?
- Is there any reason I should not boost NAD with my current conditions?
- What would a realistic expectation be?
These save with the compound when you add it to My Journal, so they’re on the printout for your visit.
How do people buy NMN?
No prescription is needed. Supplement brands and retailers sell it online and in stores.
Check with a clinician or pharmacist first if you take prescription medication or have a chronic condition.
Choose a product with independent testing, such as NSF Certified for Sport or USP Verified, because FDA does not check supplements before they are sold.
Where some people buy it
- iHerbCarries NMN from multiple brands; iHerb says brands must provide certificates of analysis.
From each provider’s own site, checked September 23, 2026. Programs change, so confirm the details before you sign up.
Where can I get NMN?
7 providers list NMN on DiscoverMedica, lowest listed price first.
Life ExtensionNMN Nicotinamide Mononucleotide vegetarian capsules, 30 count
Lowest listed priceNo prescription
$13.50listed price†
Buy at Life Extension $64.95listed price†
Buy at ProHealth Longevity † Prices as listed by the provider when we checked; they change.
Compare and learn
NMN: questions, answered
Is NMN legal to sell?
Yes. FDA said in September 2025 that it can be sold as a dietary supplement, reversing its 2022 position.
NMN or NR?
Both are NAD+ precursors. Neither has strong evidence for health outcomes in people, and they have not been compared head to head in large trials.
Does it work?
It raises NAD+ in the blood. Whether that improves health or aging in people has not been shown.
Can I get it through telehealth?
It does not need a prescription. You buy it from supplement retailers.
Important safety information
Key risks
- Short-term human studies report few side effects, but long-term safety is not established.
- FDA does not test supplements before sale, so quality varies by brand; look for third-party testing.
- Not studied in pregnancy or breastfeeding.
- Animal findings on lifespan have not been shown in humans.
Talk to a clinician first, or avoid it, if
- Pregnancy or breastfeeding: it has not been studied
- Anyone with a current or past cancer should talk to their oncologist first
- People expecting proven anti-aging effects: long-term human data do not exist
This is not a complete list of risks. Talk to a licensed clinician or pharmacist about your own situation. If you have a severe reaction, call 911. You can report side effects to the FDA through MedWatch at 1-800-FDA-1088.
Sources
- Venable LLP: FDA declares nicotinamide mononucleotide is a dietary supplement (Oct 2025)
- NMN increases muscle insulin sensitivity in prediabetic women (Science 2021)
- PubChem: Nicotinamide mononucleotide (CID 14180)
Also checked for this guide
- Oral NMN on glucose and lipid metabolism: meta-analysis of randomized trials (Crit Rev Food Sci Nutr 2025)
- NMN and physical performance: systematic review of randomized trials (Cureus 2024)
- NMN as an anti-aging health product: review (Adv Nutr 2023)
- iHerb: Quality
Guide reviewed September 23, 2026.
Educational information only, not medical advice. It does not replace a conversation with a licensed clinician.
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