TB-501

TB-501 is sometimes mentioned in relation to TB-500, but it actually isn’t a distinct or widely recognized peptide. The name TB-501 may sometimes be used mistakenly or informally to refer to TB-500, or it may represent a mislabeling in contexts where TB-500 is actually intended. 

TB-500 itself is the synthetic peptide derived from the active region of Thymosin Beta-4 (Tβ4), so if you’re seeing TB-501 in discussions, it’s likely just another way of referencing TB-500.