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How BPC-157 May Work (Preclinical Evidence) Summary: BPC-157 (a 15-amino-acid peptide) shows multi-system activity in animal and in-vitro studies, including effects on angiogenesis, nitric-oxide (NO) signaling, gastro-mucosal integrity, tendon healing pathways, and endothelial function

the product information notes that refrigeration can cause a color change (darker yellow) which does not affect safety or effectiveness

In addition, animal models of neurological injury are sometimes used to investigate the peptides effects on nerve regeneration