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TB-500 is a synthetic analogue of thymosin beta-4, a 43-amino acid protein involved in cell migration, differentiation, and tissue repair, while BPC-157 (Body Protection Compound-157) is a pentadecapeptide derived from a protective protein found in human gastric juice
This is where the nuance comes in

Aging Cell 2014;13, 379-390, doi:10.1111/acel.12185

Approaches for Enhancing Oral Bioavailability of Peptides and Proteins
