GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu is a copper peptide used in regenerative medicine to support collagen production, tissue repair, and cellular renewal throughout the body. It's for individuals looking to improve skin firmness, brightness, and visible GHK Cu Peptides: Unlocking the Copper Peptide Revolution in Skin Care Copper peptides like GHK Cu work by sending signals to your skin to repair, regenerate, and produce collagen., Its not about instant results, its about improving how your skin functions over time.,