Both BuyRetatrutide and Kensingtonlabs publish their own verifiable Janoshik certificate of analysis, so both clear The Peptide Watch's bar; ranked by most recent certificate, BuyRetatrutide (Sep 2025) is currently more recent than Kensingtonlabs (Jul 2025). Both are among the only 28 of 318 UK sellers that pass. The Peptide Watch takes no vendor money.
| Checkable fact | BuyRetatrutide | Kensingtonlabs |
|---|---|---|
| Own-name Janoshik COA | Yes | Yes |
| Latest certificate date | Sep 2025 | Jul 2025 |
| Verified rank | #25 | #26 |
Full audits: BuyRetatrutide · Kensingtonlabs. Both appear on the independently-tested list.