Independent third-party Certificates of Analysis for every peptide we sell — identity confirmed, purity measured, sterility verified. Open them. Read them. Save them.
A Certificate of Analysis is a signed lab report that confirms what's in a vial. Every COA we publish has the same four sections: identity (mass spectrometry confirms the molecule), purity (HPLC measures % active ingredient — we require ≥99.0%), sterility (USP <71> pass/fail), and endotoxins (USP <85> pass/fail).
Every COA also lists the lot number (matches your packing slip), test date, lab name + accreditation, and signed-off pass/fail on each parameter. If anything is missing, the batch doesn't ship — we don't sell what we can't certify.
Trust is built on what you can confirm independently. Every COA shows the testing lab's name and accreditation number. Look them up. Match the lot number on your shipment to the COA. We've designed this so you don't have to take anyone's word for it.
Read our full standards →Lab results published here are for informational and quality-assurance purposes. Possession of a COA does not constitute medical advice. Peptide therapy at goodtides requires a valid physician evaluation and prescription as required by law.