GHK-Cu

GHK-Cu (copper peptide GHK-Cu, or glycyl-L-histidyl-L-lysine:copper(II)) is a naturally occurring tripeptide-copper complex found in human plasma, saliva, and urine. First identified by Loren Pickart in 1973 from human albumin, GHK-Cu has become one of the most extensively studied peptides in regenerative medicine and cosmetic science, with over 60 years of cumulative research.

Mechanism of Action

GHK-Cu is a pleiotropic signaling molecule that modulates the expression of over 4,000 human genes — approximately 6% of the human genome. Its primary biological functions center on tissue remodeling: it stimulates collagen synthesis (types I and III), promotes decorin production, increases glycosaminoglycan synthesis, and activates metalloproteinase pathways for controlled tissue remodeling.

The copper ion is essential to its activity. GHK-Cu delivers bioavailable copper to cells, which is required for the function of lysyl oxidase (collagen and elastin crosslinking), superoxide dismutase (antioxidant defense), and cytochrome c oxidase (mitochondrial function). Additionally, GHK-Cu has potent anti-inflammatory effects, suppressing TGF-β and TNF-α while stimulating VEGF for angiogenesis.

GHK-Cu concentration in plasma declines with age: approximately 200 ng/mL at age 20, declining to 80 ng/mL by age 60. This age-related decline correlates with reduced tissue repair capacity.

Research Evidence

Pickart et al. have published extensively demonstrating GHK-Cu efficacy for wound healing and skin regeneration. Leyden et al. (2002) conducted a placebo-controlled clinical trial showing GHK-Cu cream significantly improved skin laxity, clarity, and firmness while reducing fine lines and wrinkles versus placebo after 12 weeks.

Canapp et al. (2003) demonstrated that GHK-Cu accelerated wound healing with 44% wound closure at day 12 versus 22% in controls. Gene expression studies (Pickart and Margolina, 2018) identified that GHK-Cu reverses the gene expression signature of COPD, metastatic colon cancer, and aggressive prostate cancer cell lines toward a healthier profile, suggesting systemic regenerative potential beyond cosmetic applications.

The Broad Institute Connectivity Map project independently identified GHK as one of the compounds that most effectively reverses age-related gene expression changes.