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Answer: GHK-Cu is a naturally occurring copper tripeptide, glycyl-L-histidyl-L-lysine bound to a copper ion, that the body produces in small amounts and that research links to skin repair, collagen synthesis, and tissue regeneration

Mechanisms of Oral Stability Structural Features Contributing to Gastric Acid Resistance: BPC-157s unusual oral stability likely results from multiple molecular features: Proline-Rich Sequence: The presence of four proline residues creates conformational constraints that reduce susceptibility to proteolytic enzymes

hdl:11380/1201437

BPC-157 is described in the literature as a synthetic pentadecapeptide constructed from 15 amino acids , studied in the context of tissue repair models, fibroblast activity, angiogenesis, endothelial function and nitric oxide-related pathways