GHK Cu Serum PLU Labs Skin Peptides UAE: GHK Cu vs GHK Basic Comparison. 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 Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb The Ordinary Multi Peptide + Copper Peptides 30ml Unichem Pharmacy GHK vs GHK Cu Without Copper, Basic Peptide Neurogan Health