TB-4 plays a central role in building and recycling actin, one of the structural proteins cells use to move and rebuild tissue. TB-500 reproduces the active region of that protein in a more stable synthetic form. It does not occur in this isolated form in nature. Research and reported use focus on four parts of recovery: Soft-tissue and muscle regeneration. The most-studied effect. TB-500 promotes cell migration and the actin regulation that lets tissue rebuild, which speeds recovery in animal injury models. Blood-vessel formation. It supports angiogenesis — the growth of new blood vessels into healing tissue — improving the blood supply an injury needs to repair. Inflammation modulation. TB-500 dampens inflammatory signaling, part of why it is used during recovery. Systemic reach. Because Thymosin Beta-4 is present throughout the body, TB-500 is studied for whole-body cell migration and regeneration rather than purely local repair.