How to Verify NMN 99.9% Purity: Reading the Lab Certificate (2026)

Q: What does HPLC mean on an NMN certificate?

HPLC (or HPLC-DAD) is a standard analytical method used to measure purity. Rokit America lists Koptri HPLC-DAD results of 99.90-99.91%.

Anyone can print "99.9%." What you actually check is the lab certificate behind it.

Bottom line. A trustworthy NMN purity figure is one that a named third-party lab measured and documented, not a number printed on the box. To verify it, look for four things on the certificate: the lab's name, the test method (such as HPLC), the test date, and the measured result. For example, Rokit America lists NMN purity tested by Koptri using HPLC-DAD at 99.90-99.91%, and Rejuvecore lists a 99.92% third-party result from KarePak LLC, California Laboratory. A "99.9%" claim without those details is just a claim.

Why purity claims need checking

NMN is taken daily over long periods, so it is reasonable to confirm the quality of the raw material rather than assume it. The catch is that "high purity" and "99.9%" are easy phrases to print, and on their own they say nothing about how the number was produced. The same figure can come from a self-declaration or from an independent lab test, and those are not equally reliable. So the useful question is not "what number is claimed" but "who measured it, and how."

Four things to look for on a real certificate

General guide to reading a certificate of analysis (COA). Always check the specific product's documentation.

Two worked examples

It is easier to see this with real products. Rokit America NMN Pterostilbene lists NMN purity tested by Koptri using HPLC-DAD, with a result of 99.90-99.91%, plus heavy metals not detected and GLP toxicity testing (5 studies). Rejuvecore NMN Powder Stick Pack lists a 99.92% third-party purity result from KarePak LLC, California Laboratory, along with its blend ratio. In both cases you can match the claimed purity to a named lab and method, which is exactly what verification means.

Check	What to look for
Lab name	A specific third-party lab, not just the words "third-party tested" (e.g. Koptri, KarePak)
Method	A named method such as HPLC or HPLC-DAD that measures purity as area %
Date / lot	A recent test date; purity can vary by raw-material lot
Result	The measured purity figure, ideally with the blend or content breakdown

Rokit America99.90-99.91% · Koptri HPLC-DAD · heavy metals not detected

Rejuvecore99.92% · KarePak LLC, California Laboratory

Verify byMatching the number to a named lab + method

If you only do one thing

If you do not have time to study a full certificate, do one check: look for the lab's name next to the purity number. A figure tied to a named third-party lab and a stated method is more defensible; a bare "99.9%" with no lab is not. From there, the same logic extends to the rest of the product, including manufacturing certification, heavy-metal screening, and a clear official seller, but the lab-backed purity figure is the single fastest signal of whether a purity claim is real.

FAQ

How do you verify NMN purity?

Look for a third-party lab certificate that names the lab, the test method (such as HPLC), the test date, and the measured purity. A "99.9%" claim with no named lab cannot be verified.

What does HPLC mean on an NMN certificate?

HPLC (or HPLC-DAD) is a standard method used to measure purity. Rokit America lists Koptri HPLC-DAD results of 99.90-99.91%.

Is a self-declared purity number reliable?

A purity number is more reliable when a named third-party lab and method back it. A self-declared figure with no certificate is harder to trust.

This article is general information to help compare products. If you have a health condition or take medication, consult a professional before use.