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What is TB-500 TB-500 is a synthetic peptide fragment derived from the naturally occurring protein Thymosin Beta-4 (Tβ4) — one of the most abundant thymic peptides found in mammalian tissues. It represents the active region of Thymosin Beta-4 and reproduces its biological and regenerative properties, being more stable and easier to produce. Thymosins are present in multiple tissues and play a role in cell protection, wound healing, and regeneration. TB-500 regulates actin dynamics, a key proce..