Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips GHK Cu Topical Cream GHK Cu G Lab Peptides GHK Cu is a powerful copper peptide that supports collagen production, skin and hair health, and tissue repair. It may help reduce fine lines, improve elasticity, and promote faster healing. Want to learn GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes