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TB-500 is a synthetic peptide derived from the active site of naturally occurring peptide thymosin beta-4 (Tβ4), specifically the sequence LKKTETQ, with an artificial acetylation at the N-terminus. It is produced through controlled solid-phase peptide synthesis and supplied by BioLongevity Labs as a lyophilized white powder in a sealed 10mg vial with no added fillers. The molecule is a member of the beta-thymosin family and is defined by its actin-monomer-sequestering activity. It is characterized in laboratory research examining cytoskeletal regulation, endothelial cell migration, and angiogenic signaling.