A certificate of analysis (CoA) is the laboratory report for one specific lot. A purity figure on a label only means something when the test report behind it can be read and checked. These are the four things to look at on any report.
The report should name the specific lot it tested, and that number should match the one on the product you hold. A report for a different lot tells you nothing about yours.
Look for what was run and how. HPLC (high-performance liquid chromatography) separates a sample so the main compound can be measured against everything else in it. Mass spectrometry reports molecular mass, which is used to confirm identity. A bare purity number with no method behind it cannot be checked.
Purity is usually reported as a percentage of the main peak. Read the figure together with the method and any stated limits. Reports that give only a rounded headline number, with no chromatogram or data attached, are harder to evaluate.
Check that the test date is recent enough for the lot, that the testing laboratory is named, and that the report is signed. If the lab states an accreditation, you can look that accreditation up with the accrediting body.
Next Level Research publishes the signed certificate of analysis for each current lot in the certificate library. Next Level Research sells research products, and everything we sell is for laboratory and research use only.
Entering the store starts with a short confirmation: you are 21 or older and you are accessing the site for laboratory research purposes only.