TB-500, also known as Thymosin Beta-4, is a synthetic peptide derived from the naturally occurring protein Thymosin Beta-4. It is a peptide fragment of the protein Thymosin Beta-4, which is found in high concentrations in blood platelets, wound fluid, and other tissues in the body.

TB-500 has been studied for its potential therapeutic effects, particularly in tissue repair and regeneration. It is believed to promote wound healing, reduce inflammation, and stimulate the growth of new blood vessels. As a result, it has garnered interest in various fields, including sports medicine, where it is sometimes used for muscle recovery and injury repair.