GHK-Cu

GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring tripeptide that binds copper ions with high affinity. First identified in human plasma by Dr. Loren Pickart in 1973, GHK-Cu was found to be present at approximately 200 ng/mL in young adults, with levels declining significantly with age. This age-related decline led researchers to hypothesize that GHK-Cu plays an important role in the body's regenerative and maintenance processes.

The peptide has been shown to influence an remarkably wide range of biological processes. At the molecular level, GHK-Cu can modulate the expression of numerous genes — studies using the Broad Institute's Connectivity Map found it could reset the expression of approximately 32% of human genes to a more youthful pattern. It promotes collagen synthesis, glycosaminoglycan production, and angiogenesis while also possessing anti-inflammatory and antioxidant properties. These combined actions make it one of the most studied peptides in dermatology and skin science.

In dermatological applications, GHK-Cu has been extensively studied for wound healing and skin rejuvenation. Clinical studies have demonstrated its ability to improve skin firmness, elasticity, and clarity when applied topically. It has been shown to reduce fine lines and wrinkles, improve skin density, and accelerate wound healing. Topical GHK-Cu creams have been found to perform comparably to retinol and vitamin C in some skin rejuvenation metrics.

Beyond skincare, research has explored GHK-Cu's potential systemic effects, including promotion of hair growth, bone repair, and even lung tissue remodeling. The peptide's copper delivery mechanism is particularly interesting, as copper is a cofactor for numerous enzymes involved in tissue repair, including lysyl oxidase (critical for collagen and elastin cross-linking) and superoxide dismutase (an antioxidant enzyme). GHK-Cu remains one of the most evidence-supported peptides for cosmetic and regenerative applications.