HPLC (high performance liquid chromatography) separates a sample so you can see the main peak and any impurity peaks, which is why it is the standard purity method for peptides. Third-party testing matters because a lab with no stake in the sale has less reason to inflate the number, so an independent COA carries more weight than an in-house one. Purity by HPLC is best paired with an identity check such as mass spectrometry, since purity alone does not confirm the peptide is what the label says. Always match the report to the specific lot you received. This is general information, not medical advice. Do not buy or sell prescription or illegal substances on this forum. Learn more: how to read a peptide COA
Spotting a faked COA is a great topic, catches a lot of people.
Wish I had found this thread sooner.
How solid is the human evidence versus animal studies here?
Appreciate the neutral take, hard to find that.
This cleared up a lot for me, thank you.