Peptide BPC 157 Does It Work? Breaking Down the Evidence and the Hype BPC 157 & The Gut Brain Axis: A Practitioner's Definitive Review of the Evidence BPC 157 is one of the peptides that has been getting a lot of attention recently. It is a synthetic peptide derived from a protein found in human gastric juice. In experimental research, The Stable Gastric Pentadecapeptide BPC 157 Pleiotropic Beneficial Activity and Its Possible Relations with Neurotransmitter Activity