GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration Viral claim says GHK Cu reset nearly 4,000 genes to a younger state and increased collagen production in a preclinical study. This refers to research on GHK Cu, a naturally occurring copper binding peptide that GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes