TB-500
Also: TB 500, thymosin beta-4 fragment, Tβ4 fragment
A synthetic fragment of thymosin beta-4, a naturally occurring protein involved in actin regulation and cell migration. Research has examined TB-500 in animal models for effects on wound healing and soft tissue repair. It has limited published human trial data and is not FDA-approved; FDA's Pharmacy Compounding Advisory Committee gave it a favorable recommendation for compounding eligibility in July 2026.