What This Site Is
Peptide Source Review is a directory of US peptide companies, scored using a published, consistent formula. The goal is simple: cut through marketing copy and SEO-tier "top 10" lists, and tell you which vendors actually back up their claims with verifiable lab testing, transparent business practices, and a reliable customer experience.
What This Site Is Not
- Not a store. We don't sell peptides and we don't ship anything.
- Not paid promotion. No vendor pays for placement, ranking, or removal. No affiliate kickbacks influence scores.
- Not medical advice. Nothing here is a recommendation to use any substance. Talk to a qualified medical professional about what's appropriate for you.
- Not legal advice. Peptide laws vary by state and country and change frequently. Verify the rules where you live before ordering anything.
Why This Site Exists
The peptide industry is full of vendors whose websites all look the same: glossy product shots, vague claims of "purity," badges that link nowhere. Most "best peptide vendor" lists you'll find online are sponsored content, affiliate-driven, or written by the vendors themselves under different names.
Consumers deserve a clear, methodical way to compare these companies — one that puts safety and transparency first, weighs evidence the same way for every vendor, and shows its work. That's what this site tries to be.
The State of the Market
The peptide vendor space has consolidated significantly in 2025 and 2026. Several major vendors — Peptide Sciences, Amino Asylum, Paradigm Peptides, and Science.bio among them — have shut down due to FDA action, criminal charges, or voluntary closure. The compounding-pharmacy side of the market has also tightened sharply as FDA shortage exemptions for GLP-1 peptides like semaglutide and tirzepatide have ended.
We update the vendor list as the market changes. If a company on this site has closed, please let us know.
How We Score
Every vendor is scored on four dimensions — Quality & Safety, Transparency, Customer Experience, and Value — then combined with public weights, with a hard safety cap if third-party testing isn't verified. The full breakdown, including a worked example, is on our How We Rate page.
Corrections and Contact
Found a vendor we missed? A company that's closed? A score that doesn't match the evidence? Let us know so we can update.
Email peptidesourcereview@gmail.com with corrections, vendor tips, closed-shop reports, or feedback on the methodology.