Description
TB‑500 is a lab‑made peptide marketed as a research analogue of thymosin‑β4 (Tβ4)—a naturally occurring 43‑amino‑acid protein abundant in platelets and many tissues. Tβ4 is a major G‑actin–sequestering protein involved in cell migration and tissue repair. Commercial “TB‑500” products aim to capture some of Tβ4’s pro‑healing biology, but TB‑500 itself is not an FDA‑approved drug, and real‑world products can vary widely in identity and purity. It is prohibited in sport.






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