Peptide vendor reviews: the best peptide companies, ranked by 12,369 independent lab tests

The peptide companies with A or B grades across many recent independent lab tests: the vial held the right peptide, at the stated dose and high purity. The peptide vendor list ranks every company, and each peptide's page ranks the vendors for that peptide only.

From the vendors' own websites. Each peptide has a page listing every vendor that sells it, with price per mg, lab results and which shops have closed. We don't sell peptides.

Look the vendor up above. Its review shows every independent lab test we hold, whether the store is still open, and whether a look-alike site uses its name. For shops we haven't covered, use the seven checks in our verification guide.

No. Peptide Sciences says it discontinued all research-use-only product sales in March 2026 and has authorized no replacement website or successor. Sites using a similar name are not the original company.

From independent lab tests of that vendor's vials: whether each was the right peptide, how pure it was and how much was actually in it. Each review grades every tested product, shows how far the evidence can be trusted, and links to the original lab reports.

No grade means we don't hold enough independent tests to grade it. It is not a finding that the vendor is a scam.

No. Grades describe the samples tested; some links earn us a commission, but never change a vendor's grade.