Copper peptide GHK-Cu is a naturally occurring copper complex of the tripeptide glycyl-L-histidyl-L-lysine with a strong affinity for copper(II).  It can also be found in human plasma, saliva, and urine. GHK-Cu is believed to work by binding to copper ions and activating various biological pathways, including the promotion of antioxidant activity, modulation of the immune response, and stimulation of cell proliferation and differentiation.

There is good evidence that GHK-Cu is beneficial in wound healing, suppressing free-radical damage, increasing protein synthesis, fighting bacteria, and increasing the health of skin and fibroblasts. It has been found to stimulate collagen production, enhance wound healing, reduce scar formation, and improve skin elasticity. It has also been shown to have a positive effect on hair growth, bone density, and nerve regeneration.