The cheapest UK seller that publishes its own verifiable Janoshik certificate is Phoenixbiolabs at £1.61/mg for BPC-157 (checked 10 July 2026). Price alone tells you nothing about what is in a vial, so this ranks only the 28 UK sellers whose testing you can independently verify, cheapest first, benchmarked on BPC-157 as pounds per milligram.
| Verified seller | BPC-157 | Latest own-name COA |
|---|---|---|
| Phoenixbiolabs | £1.61/mg | Apr 2026 |
| Peptideprime | £1.8/mg | May 2026 |
| Ck Peptides | £2.4/mg | Mar 2026 |
| Lab77Peptides | £2.5/mg | Jun 2026 |
| Biohackpeptides | £2.5/mg | May 2026 |
| Simplypeptides | £2.5/mg | various |
| Peptifyuk | £2.7/mg | May 2026 |
| Xlpeptides | £2.8/mg | Mar 2026 |
| Peptology Labs | £3/mg | Jun 2026 |
| Peptidesresearch | £3/mg | May 2026 |
| Unionbiolabs | £3/mg | Apr 2026 |
| Ascendpeptidesuk | £3/mg | Mar 2026 |
| Regenix Peptides | £3/mg | Mar 2026 |
| Kensingtonlabs | £3/mg | Jul 2025 |
| Imperialpeptides | £3/mg | 2025-2026 |
| Thoroughbredlabs | £3.4/mg | Sep 2025 |
| Momentumpeptides | £3.5/mg | May 2026 |
Most of the very cheapest UK sellers publish no certificate you can verify, so a low price buys an unknown vial. Every seller above has a Janoshik certificate in its own name you can check yourself. Cheap and checkable beats cheap and unknown.
See the full independently-tested list or the market statistics.