Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true?, Copper peptide, known as GHK Cu, has a growing body of peer GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes Copper, Collagen, and Controversy: Inside the GHK Cu Buzz