Peptide Vendor Directory
Browse our directory of peptide research vendors with editorial ratings across 8 quality dimensions. Each vendor is evaluated for COA quality, transparency, community reputation, and more to help you make informed decisions.
108
Vendors
6.3
Avg Score
9
Countries
69%
3rd-Party COA
How to Choose a Peptide Vendor
Selecting a reliable peptide vendor is critical for research quality and safety. Third-party certificates of analysis (COAs) are the single most important factor to verify, as they confirm peptide identity, purity, and absence of contaminants like endotoxins and heavy metals.
Look for vendors that provide publicly accessible COAs from independent labs, not just in-house testing. The testing lab should ideally hold ISO 17025 accreditation and use validated methods like HPLC for purity and mass spectrometry for identity.
Community reputation matters. Check forums and review communities for consistent feedback over time. A vendor with years of positive track record is generally preferable to a newer supplier with no history, even if prices are higher.
Our editorial scoring system evaluates vendors across 8 dimensions, with COA quality and transparency weighted most heavily. Scores reflect our assessment based on publicly available information and are updated regularly.
Disclaimer: Vendor and lab listings are for informational purposes only. Peptide Protocol Wiki does not sell, endorse, or guarantee any vendor, product, or testing service. Always verify vendor claims independently.