GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips What Is GHK Cu? How It Works in Research and Quality Signals GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true?, Copper peptide, known as GHK Cu, has a growing body of peer GHK Cu: A copper bound peptide that stimulates collagen and healing. Used for skin repair and anti aging, it may reduce wrinkles, improves hair growth, and boosts metabolism, providing patients with firmer skin and a