The background you need to read a fact sheet critically. Written for laboratory buyers; nothing here is medical advice.
ISO/IEC 17025 for peptide testing labs: accreditation bodies such as A2LA and ANAB, scope of accreditation, certificate lookup, and certified versus accredited.
Updated 2026-10-19
Eight supplier red flags we record: gated certificates, no lab named, no address, health claims, irreversible-only payments, lookalike domains, FDA letters.
Updated 2026-10-19
Per-lot certificates of analysis versus one representative sample COA: why it matters when evaluating a peptide supplier and how to tell which one is published.
Updated 2026-10-19
What an HPLC purity percentage measures for research peptides, why 99% does not confirm identity, area percent versus net content, and reading a peak table.
Updated 2026-10-19
The data-collection process behind peptideranking.org: pages read, fields captured, how not verified is handled, the CSV and JSON dataset at /data/, corrections.
Updated 2026-10-19
Section-by-section guide to a peptide certificate of analysis: header, lot number, method, result, laboratory signature, and what a vague COA leaves out.
Updated 2026-10-19
Where the FDA publishes warning letters, how to search by company, what a letter does and does not establish, and how this site records them in supplier data.
Updated 2026-10-19
What LAL endotoxin tests (USP 85) and USP 71 sterility tests report for research peptides, why HPLC purity covers neither, and how each appears on a COA.
Updated 2026-10-19