A natural signaling peptide (glycyl-histidyl-lysine) in a complex with a copper ion Cu²⁺. GHK is present in human blood plasma, and its level decreases with age. GHK-Cu activates fibroblasts and stimulates the synthesis of collagen, elastin, glycosaminoglycans and decorin. Regulates the remodeling of the extracellular matrix through the balance of metalloproteinases (MMP) and their tissue inhibitors (TIMP): promotes the removal of damaged structures and their replacement with new ones. Has antioxidant and anti‑inflammatory effects, supports skin recovery after damage.