TB-500 is a seven-amino-acid fragment of thymosin beta-4. A plain-language tour of every research area the published record actually covers, and what it does not.
The 2026 WADA Prohibited List names Thymosin-beta4 and its derivatives e.g. TB-500 under section S2.3. Here is the quoted text, the source PDF, and what it covers.
TB-500 is a seven-amino-acid fragment of thymosin beta-4, a 43-amino-acid protein about five times heavier. Here is what the published research actually tested.
What published research reports about TB-500 and thymosin beta-4 safety, including the one human safety study, the negative findings, and the gaps nobody has filled.
No human trial has ever tested TB-500 itself. The eleven human studies people cite all used thymosin beta-4, the larger parent protein. Here is the full list.
The published thymosin beta-4 study figures, the animal numbers, and the honest answer for TB-500 itself: no human dose has ever been published.
What amounts has BPC-157 research actually used? The published animal figures, the human-tissue concentrations, and the honest answer on human dosing: none is published.
BPC-157 is studied in animal, cell, and tissue models of tendon, gut, blood vessel, nerve, and wound repair. A plain-language map of every research area.
BPC-157 is on the WADA Prohibited List in Section S2, prohibited at all times for tested athletes. What that means, and why the source is no defense.
BPC-157 and KPV are studied for different things, and both appear in gut research. A plain-language look at what the published work covers and what it does not.