GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu Blue Skies Health & Wellness Clinic 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 Copper Peptide Benefits, Uses & Safety Intra V GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration