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 repair, and GHK cu 100cu PV Peptides GHK Cu Copper Peptide 100mg Cambridge Quantum Bio GHK CU COPPER PEPTIDE 5MG 10MG 50MG 100MG VIAL UMBRELLA Labs GHK CU 100mg 99%+ Purity, COA Verified GHK Cu True Lab Peptides