Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol Hebe GHK for Hair Loss Just 3 Months In! GHK Cu is a game changer for hair restorationjust 3 months of treatment and the difference speaks for itself. Stimulates growth Copper Peptide (GHK Cu) Pro Skin Care Serum with Hyaluronic Acid eBay Copper Peptides (GHK Cu): What They Are, How They Work, and What Evidence Really Shows VIDA Integrative Medicine GHK Cu Peptide Progress: Week 3 Results