49 suppliers scored7 FDA warning letters tracked8 closures on recordUpdated October 2026 · How scoring works
Peptide Ranking

Advertising and relationships disclosure

Read this before you trust a score. It is short on purpose.

Referral links

Some outbound links to suppliers may carry a referral or affiliate code. If you buy after following one, the supplier may pay this site a commission. The price you pay is not affected. Referral links are not available for every supplier, and whether one exists has no effect on the score, rank or wording of any page.

Industry relationships

The people who produce this site have worked in, and have financial interests in, the research-peptide supply industry, including with suppliers that appear in the rankings. We manage that conflict in three ways: the scoring formula is published in full and applied identically to every supplier; every fact on a supplier page cites its source; and the complete dataset is downloadable so anyone can recompute the table. If a listed supplier is connected to the people behind this site, that connection is noted on the supplier's page.

What we do not accept

  • Payment for inclusion, placement, rank or wording.
  • Free products in exchange for coverage.
  • Requests to remove accurate negative facts (warning letters, closures, gated certificates).

Corrections

Suppliers and readers can request a factual correction through the contact page. We change facts when shown evidence; we do not change scores on request.