Both Peptifyuk and Biohackpeptides publish their own verifiable Janoshik certificate of analysis, so both clear The Peptide Watch's bar; ranked by most recent certificate, Peptifyuk (May 2026) is currently more recent than Biohackpeptides (May 2026). Both are among the only 28 of 318 UK sellers that pass. The Peptide Watch takes no vendor money.
| Checkable fact | Peptifyuk | Biohackpeptides |
|---|---|---|
| Own-name Janoshik COA | Yes | Yes |
| Latest certificate date | May 2026 | May 2026 |
| Verified rank | #6 | #7 |
Full audits: Peptifyuk · Biohackpeptides. Both appear on the independently-tested list.