GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting Let's talk about one of my FAVORITE glow peptides: GHK Cu GHK Cu (Copper Peptide) is a naturally occurring peptide in your body that plays a HUGE role in healing, repair, and overall GHK Cu Peptide Skin Cream Levers.Health GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration