The state of UK peptide testing: how many sellers you can actually verify (2026)
These are the market-level figures from The Peptide Watch's ongoing audit of every identifiable UK research-peptide seller. Each is a single number with the date it was measured, computed from the same daily audit that powers the directory.
📊 As of 20 October 2026, of 536 active UK research-peptide sellers audited by The Peptide Watch, 40 (7%) publish their own verifiable Janoshik certificate of analysis.
📊 496 of the 536 active sellers (93%) publish no certificate that can be verified in their own name.
📊 The Peptide Watch has audited 697 UK research-peptide domains in total: 536 active retailers, 112 dead or parked, and 49 out of scope.
📊 Every verified certificate in this audit was issued by a laboratory outside the UK (Janoshik in Prague, or Analiza in Poland); no UK laboratory issued a single verified report.
📊 15 clusters of separately-branded UK shops trace back to a single shared operator, so some apparent competitors are the same seller.
What "pass" means here, precisely
A seller passes only when it publishes an own-name Janoshik certificate of analysis that can be verified on Janoshik's own website. "7%" is 40 of the 536 active retailers; the wider figure of 697 is every domain ever audited, including 112 that are now dead and 49 out of scope. One definition, stated once.
Questions people ask
What share of UK peptide vendors are independently lab-tested?
As of 20 October 2026, 40 of 536 active UK research-peptide sellers (7%) publish their own verifiable Janoshik certificate of analysis; the other 93% do not. The Peptide Watch has audited 697 UK domains in total.
How many UK peptide vendors are there?
The Peptide Watch has audited 697 UK research-peptide domains: 536 active retailers, 112 dead or parked, and 49 out of scope.
Is there a UK laboratory that tests research peptides?
No verified certificate in this audit came from a UK laboratory. The independent labs legitimate UK sellers actually use are abroad: Janoshik in Prague and Analiza in Poland.
Full underlying data: machine-readable dataset (CC BY 4.0). Methodology: how every verdict is reached.