GHK-Cu, also known as copper peptide, is a naturally occurring peptide composed of three amino acids (glycyl-L-histidyl-L-lysine) complexed with copper. It plays a role in various biological processes, including wound healing, tissue regeneration, and skin rejuvenation. GHK-Cu stimulates the production of collagen, elastin, and glycosaminoglycans, which are essential for maintaining skin structure and elasticity. It also exhibits antioxidant and anti-inflammatory properties.