Monthly report

State of peptide vendors

Each month, the state of the US research-peptide vendors we review, generated from the audit data behind every score: testing-gate pass rate, median scores, certificates, and which scores moved. Every month has a CSV, free to reuse under CC BY 4.0.

Vendors reviewed: 100
Vendors reviewed
Pass testing gate: 68%
Pass testing gate
Median score: 6.44
Median score

Read the latest: November 2026 (to November 6, 2026)

As of November 6, 2026, Peptide Source Review lists 100 vendors. 68% (68) pass the testing gate, and the median overall score is 6.44 of 10, with a median lab score of 7.0. We hold 1,760 certificates of analysis; 87% were confirmed at the issuing laboratory, the median purity they report is 99.69%, and 40% include an endotoxin or sterility test. In November 2026 (to November 6): 8 vendors published for the first time, 67 score moves of 0.05 points or more were logged across 49 vendors (25 up, 42 down), 1 vendor removed, 2 laboratories found not to be established as independent. The largest rise was Arctic Lab Supply (6.16 to 6.98). The largest fall was Cernum Biosciences (5.24 to 4.50).

Affiliate status never affects scores. Scores follow our published methodology; how we keep affiliates out of it.

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