GHK-Cu is a naturally occurring copper peptide — a complex of three amino acids (glycine-histidine-lysine) bound to a copper ion. First identified in human plasma in 1973, it remains one of the most studied peptides in dermatology for its role in skin repair and recovery.
Research on copper peptides focuses on their interaction with fibroblasts, the cells responsible for producing the structural proteins that give skin its firmness and texture. Studies have shown that GHK-Cu supports the activity of transforming growth factor beta (TGF-β), a signalling protein involved in tissue repair. The result is an environment in which the skin's natural support structures are maintained more effectively.
Multiple controlled studies have demonstrated that GHK-Cu at 1-10 μM is associated with increased collagen synthesis in aged human fibroblast cultures. It also supports the organization of collagen fibrils — a factor that separates structurally sound skin from skin that has lost its tensile strength.
The copper ion itself plays a supporting role in superoxide dismutase (SOD) activation, an endogenous antioxidant that neutralises free radicals. This dual function — structural support plus antioxidant activity — makes copper peptides a well-documented choice for post-procedure recovery, photodamaged skin, and age-related changes in skin firmness.
Stability is the practical challenge. Copper peptides degrade in the presence of light, air, and incompatible ingredients (particularly strong acids and vitamin C). Liposomal encapsulation and pH-buffered formulation are required to keep GHK-Cu bioactive through the product's lifespan. This is one reason why a vacuum pump and made-to-order production matter — they preserve the ingredient's activity from compounding to your skin.