Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin Copper peptides like GHK Cu work by sending signals to your skin to repair, regenerate, and produce collagen. It's not about instant results, it's about improving how your skin functions over time. Dr. Copper Tripeptide (GHK Cu) for Advanced Skincare & Haircare Formulatio GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B