Copper Peptide Regenerating Serum for Glowing Skin and Hair GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu Focal Point Vitality GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration 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