Where to buy TB-500 (Thymosin Beta-4 fragment) in the UK, and how to check it's real
To buy TB-500 in the UK from a seller whose testing you can actually verify, choose one of the 30 UK sellers that publish their own verifiable Janoshik certificate of analysis (of 326 active UK sellers, only 9% do). TB-500 is a synthetic fragment of the naturally occurring protein Thymosin Beta-4, studied in research on cell migration and angiogenesis. Because it is usually sold alongside BPC-157, it inherits exactly the same certificate problems. Purity and identity cannot be judged by eye, so an independent certificate you can check is the only real proof of what is in the vial.
The one test that matters for TB-500
Ignore the marketing. The question is simple: does the seller publish a verifiable Janoshik certificate that names the seller itself as the client? If it does, you can confirm an independent lab tested that batch. If it shows an in-house document, a borrowed certificate, or "COA on request", you cannot. Learn the two-minute check in how to verify a Janoshik COA.
Which UK sellers publish a verifiable COA
Of the 326 active UK research-peptide sellers we audit, only 30 (9%) publish their own verifiable Janoshik certificate. Any of them is where you can actually verify testing, for TB-500 or any compound. A few: Incline Peps · Lab77Peptides · Peptology Labs · Biohacklondon · Velonix Labs · Peptide Biosciences. See the full independently-tested list, or check a specific shop's certificate with the free COA Checker.
Verified UK vendors with a confirmed TB-500 Janoshik certificate (10)
- Biohacklondon biohacklondon.com · own-name Janoshik COA Jun 2026
- Peptifyuk peptifyuk.com · own-name Janoshik COA May 2026
- Biohackpeptides biohackpeptides.co.uk · own-name Janoshik COA May 2026
- Phoenixbiolabs phoenixbiolabs.net · own-name Janoshik COA Apr 2026
- Xlpeptides xlpeptides.com · own-name Janoshik COA Mar 2026
- Ascendpeptidesuk ascendpeptidesuk.com · own-name Janoshik COA Mar 2026
- Tested Peptides testedpeptides.co.uk · own-name Janoshik COA Jan 2026
- Thoroughbredlabs thoroughbredlabs.co.uk · own-name Janoshik COA Sep 2025
- Kensingtonlabs kensingtonlabs.co.uk · own-name Janoshik COA Jul 2025
- Imperialpeptides imperialpeptides.co.uk · own-name Janoshik COA 2025-2026
Each entry is confirmed directly from that vendor's own-name Janoshik report on the laboratory's own site. This list is not exhaustive: a verified vendor not shown may also test TB-500, and compounds are added as each certificate is confirmed.
An honest note: a verifiable certificate proves a sample of a batch was tested, not that the specific vial you receive matches it, see what this can and can't tell you. The Peptide Watch sells no TB-500 and links to no shop; this is research-use-only information, not medical or dosing advice.
Other compounds: BPC-157 · GHK-Cu · Ipamorelin · CJC-1295 · MOTS-c · Epithalon · Selank · Semax · Tesamorelin · Cagrilintide · Melanotan 2 · KPV · PT-141 · SS-31 · DSIP