Is NMN legal in the US?

Updated November 3, 2026. For information only, not medical advice or legal advice. This guide has no affiliate links, and we do not link to NMN products.

Related: Is NMN FDA approved?

Short answer

Basis: FDA letter, Docket FDA-2023-P-0872 (opened November 3, 2026); US Google autocomplete, Nov 3, 2026 (“is nmn legal in usa”).

In a September 2025 letter, the FDA wrote: “we now conclude that NMN is not excluded from the definition of dietary supplement under section 201(ff)(3)(B)”. We found no FDA ban on NMN. This is about how NMN is classified. It is not a safety finding, an approval or legal advice.

What did the FDA say in 2025?

Basis: FDA letter, sections I.C, II.A.4.b and II.B.

Federal law can keep an ingredient out of the supplement category if it was authorized for study as a new drug before it was sold as a supplement. On October 11, 2022, the FDA told one company that NMN was excluded from the definition of a dietary supplement, and it sent similar letters to other firms.

In the 2025 letter the FDA changed how it reads that rule. It said it “is aware of evidence that NMN was marketed as a dietary supplement in the United States as early as 2017”, which came before NMN was authorized for investigation as a new drug.

What this does not mean

Basis: FDA letter, footnotes 41 and 44; FDA, “Information for Consumers on Using Dietary Supplements” (content current as of October 21, 2022).

• Not a safety or effectiveness finding. The letter says a product’s safety profile does not decide whether it was marketed as a supplement.
• Not a free pass. The FDA can still use seizures and recalls to remove an unsafe or adulterated supplement.
• Still under review. The FDA said it continues to examine the evidence on NMN’s US marketing.
• Not an approval. Why is NMN not FDA approved? The FDA says it “is not authorized to approve dietary supplements for safety and effectiveness before they are marketed.” See Is NMN FDA approved?

Is NMN banned in the US, or still banned by the FDA?

Basis: US Google autocomplete, Nov 3, 2026 (“is nmn banned in the us”, “is nmn still banned by fda”); FDA letter, sections I.C and II.

The letter does not use the word “banned”, and we found no ban in it. It does describe the earlier 2022 position that NMN was excluded, and it reverses it: “we no longer find that NMN is excluded under section 201(ff)(3)(B)”. The letter covers one question about the supplement definition, not every rule that can apply to a product.

Where to read more

Availability varies by country; check local rules before buying. We do not link to NMN products.

• NMN guide: what trials show.
• NMN vs NR
• How to choose an NMN supplement: information only.
• NR guide: the NAD+ supplement we cover.

FAQ

Is NMN banned in the US?

We found no FDA ban on NMN in the letter. The FDA’s earlier 2022 position was that NMN was excluded from the supplement definition. Its September 2025 letter says it no longer finds that. That is a statement about classification, not a safety finding.

Basis: US Google autocomplete, Nov 3, 2026 (“is nmn banned in usa”, “is nmn banned in the us”); FDA letter, Docket FDA-2023-P-0872.

Is NMN illegal in the US?

We did not find the FDA saying that NMN is illegal. Its 2025 letter says NMN is not excluded from the supplement definition under one section of the law. This summarizes one letter, not the whole body of law, and it is not legal advice. Ask a lawyer about your case.

Basis: US Google autocomplete, Nov 3, 2026 (“is nmn illegal in us”); FDA letter, Docket FDA-2023-P-0872.

Is NMN safe?

In a 2026 meta-analysis of short trials (14 days to 24 weeks), oral NMN did not increase adverse events. Long-term safety is not established, and the FDA letter is not a safety finding. See our NMN guide for the studies, and ask a clinician if you take medicines.

Basis: US Google autocomplete, Nov 3, 2026 (“is nmn safe for humans”); PMID 42514320.

Sources

Pages were opened on November 3, 2026.

1. US Food and Drug Administration. Response to citizen petition, Docket FDA-2023-P-0872 (letter dated September 29, 2025; the PDF’s date line misprints the year as 2029). Read from the official regulations.gov PDF.
2. US Food and Drug Administration. Information for Consumers on Using Dietary Supplements (content current as of October 21, 2022).
3. Yang W et al. Safety and metabolism-related outcomes of oral nicotinamide mononucleotide supplementation in adults: a systematic review and meta-analysis. Nutrients, July 10, 2026. PubMed

This article is for information only and is not medical advice. Speak to a healthcare professional before changing medication or supplements.