GHK Cu Copper Peptide Serum for Face Anti Wrinkle Increase Collagen Anti Aging Peptide Labz 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 Copper Peptide Benefits, Uses & Safety Intra V Advanced Copper Peptide Serum 300mg High Purity (99.6%) GHK Cu Mul Sapnne Naturals GHK CU