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 GHK Cu Focal Point Vitality The Notable Benefits of Copper Peptides for the Body Tripeptides Ghk and GhkCu modified silver nanoparticles for enhanced antibacterial and wound healing activities ScienceDirect