GHK Cu, or copper peptide GHK-Cu, is a peptide complex composed of the tripeptide glycyl-l-histidyl-l-lysine and copper. It is a naturally occurring peptide in the human body and has been studied for its potential benefits in various health and skincare applications.

Research suggests that GHK-Cu may have antioxidant properties and could play a role in promoting wound healing, collagen synthesis, and tissue repair. Additionally, it has been explored for its potential anti-ageing effects on the skin.

The human peptide GHK (glycyl-l-histidyl-l-lysine) has multiple biological actions, all of which, according to our current knowledge, appear to be health positive. It stimulates blood vessel and nerve outgrowth, increases collagen, elastin, and glycosaminoglycan synthesis, as well as supports the function of dermal fibroblasts.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073405/