Identity/Purity (HPLC): Confirms the substance is actually tirzepatide (or whatever peptide is claimed) and measures purity percentage.
Mass: Measures how many mg are actually in the vial versus what's labeled.
Endotoxins: Measures bacterial endotoxin levels. The FDA threshold for compounding is 10 EU/mg. Jano reports in EU/vial—divide by the mg content to get EU/mg. To date, no gray-market lyophilized peptide has failed this threshold.
Sterility: Many gray-market products fail sterility testing—this is expected and is why filtering is essential.