GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration GHK Cu Copper Peptide Serum Scar Repair & Collagen Support Studd Muffyn