Flawless skin at 50 (pretty dang close to it, anyway) And how do I retain this radiant glow? Copper Peptide GHK Cu: They are naturally found in the human body, have skin GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes GHK Cu Copper Peptide Skincare Bundle RegenMed Direct GHK Cu Copper Peptide Skincare Bundle RegenMed Direct GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy