Peptide testing guides.
Straight answers on what peptide testing actually tells you — how to read a certificate of analysis, what the numbers mean, and how to look up a COA. Written by an independent lab that doesn't sell peptides.
How to verify a peptide COA
Thirty seconds on the lab's own site beats any PDF. Copy the certificate ID exactly as printed, paste it into the lookup →, and check that the title and date match the paper in your hand. A match means the lab issued that ID; a miss means a typo — or a forgery. Red flags: IDs in the wrong format, lab names that don't match the issuing site, and sellers who won't link you to the live lookup.
How peptide identity is confirmed
“Identity: conforms” stands on three legs: the sample's retention time matches a certified reference standard run under the same method, its UV spectrum matches at 214 nm, and the quantified assay is consistent with the declared compound. One leg wobbling is enough to fail the sample.
Purity vs. net-peptide content
Chromatographic purity (area %) tells you what fraction of the detected material is your peptide. Net-peptide content (mg/vial) tells you how much peptide mass is actually in the vial — salts, water, and counter-ions don't count. A vial can be 99% pure yet contain less peptide than the label claims. That's why every COA we issue reports both numbers.
How to read a COA
Check three things: (1) identity — does the retention time match the reference standard? (2) purity — the main-peak area % and the impurity profile; (3) assay — the measured mg/vial next to the label claim. Then confirm the certificate ID in our lookup →
Turnaround, explained
Standard turnaround is 10–12 business days from the day your sample arrives at the lab — shipping time doesn't count. Rush service (up to 4 vials) returns results in 4 business days. Larger batches that need expediting are quoted by arrangement. See pricing →