About the data

247 peptide vendors indexed as of September 27, 2026.

How vendors are found

Existing peptide directories, search results, public domain-registration records and community discussion are used only as leads. Every fact shown on PepAssess is collected directly from the vendor's own website.

What each profile records

Lab-results (COA) pages and named laboratories; published email, phone and contact page; refund and shipping policies; payment methods; research-use labeling; store platform and catalog size; affiliate program (shown for transparency, never scored); and how many independent directories also list the vendor. Each profile shows the date it was last checked.

Citing PepAssess

Please cite figures with their date — for example: "PepAssess indexed 171 vendors publishing a lab-results page as of September 27, 2026." A plain-text brief for AI assistants is at /llms.txt.

Commercial separation

Affiliate relationships, advertising and sponsorships never change a vendor's score or ranking. Sponsored placements are always labeled.