June 5, 2026 · Lab Best Practices
Understanding Certificates of Analysis for Research Peptides & Compounds
A proper COA for research peptides and compounds should include identity (HPLC or MS), purity (typically ≥98–99%), net content, endotoxin limits, sterility (USP <71>), heavy metal screening, specification conformity, and — where offered — fentanyl contaminant screening.
Always cross-reference the lot number on the vial with the COA provided. Discrepancies should be reported immediately to the supplier.
Third-party testing from accredited labs (ISO 17025) provides the highest confidence for laboratory records and publications.
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