Highest-Purity NMN Guide
What Is the Highest-Purity NMN? How to Verify Purity, Testing & COAs
Reviewed by Dr. Hector Valenzuela, Ph.D., Chief Science Officer · Updated June 2026
How to verify NMN purity in 60 seconds
- 98%+ purity — look for at least 98% on the label and the COA.
- Beta-NMN (β-NMN) — the biologically active form. Avoid alpha-NMN, which your body does not use the same way.
- Independent third-party HPLC test — run by a lab with no financial tie to the brand.
- A public, batch-specific COA — openable on the website, matching the batch you receive.
Why NMN purity is a real problem
Independent testing has repeatedly found that many NMN products contain far less NMN than the label claims — in one widely cited analysis of top-selling products, a majority tested below detectable NMN levels, and some contained none at all. That is the main reason people report that an NMN supplement “did nothing”: if the powder is not actually NMN, it cannot do what the research describes. Purity is not a nice-to-have; it is the difference between taking NMN and taking filler.
What a public COA actually proves
A real Certificate of Analysis from an independent lab verifies four things: identity (it is genuinely beta-NMN), purity (the percentage of actual NMN), potency (the dose matches the label), and safety (screening for heavy metals and contaminants). A brand that posts a current, batch-matched COA is letting you check its work. A brand that only says “third-party tested” without showing the document is asking you to take its word for it.
Which brands publish COAs
To its credit, the better end of the market has moved toward transparency: several reputable NMN brands now publish lab data or COAs on their product pages. RevGenetics was the first supplement company to make public COAs standard, starting in 2007, and continues to publish them for Advanced NMN (98%+ purity, third-party HPLC tested). When you compare options, compare the documents — not the marketing.
Frequently asked questions
What purity should NMN be?
Aim for 98%+ beta-NMN. Independent testing has found products as low as 80% (or with no detectable NMN at all), so the percentage on a verified COA matters more than any claim on the front of the bottle.
What is beta-NMN versus alpha-NMN?
Beta-NMN is the biologically active form your body converts toward NAD+. Alpha-NMN is a different structural isomer the body does not use as readily. Look for “beta” (β) on the label and COA.
How do I read an NMN COA?
Check that it is recent and batch-specific, that the assay method is HPLC, that purity is 98%+, and that heavy-metal screening passed. The batch number on the COA should match the bottle you received.
Why didn't my NMN seem to do anything?
The two most common reasons are low purity (the product was not really NMN) and under-dosing (too little per serving). A verified 98%+ COA and a clinical-range dose address both.
