GHK-Cu
Also: GHK-Copper, copper peptide, GHK tripeptide
A naturally occurring copper-binding tripeptide (glycyl-L-histidyl-L-lysine) studied for signaling effects linked to collagen synthesis, wound healing, and antioxidant activity in skin. Research is concentrated in cell-culture, animal, and topical cosmetic studies rather than large randomized human trials. GHK-Cu is used in cosmetic formulations and has also been discussed as a nominated substance in FDA's peptide compounding review process.