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TB-500 vs BPC-157: Systemic vs Local Research Rationale Comparison TB-500 BPC-157 Research identity Fragment associated with thymosin beta-4 15-amino-acid gastric peptide Common protocol rationale Often described as systemic because Tβ4-related signaling involves cell migration and actin regulation across tissues Often described as local or site-focused in community protocols Evidence caution Parent Tβ4 evidence is not the same as proof for every TB-500 product Evidence remains predominantly preclinical and does not establish an approved human protocol “Local” and “systemic” are useful shorthand for the rationale people cite, but they should not be treated as proven administration rules