Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK cu Cosmetic Topical 5x 1g Ampules NEXAPH InfiniWell, GHK CU, 30 ml GHK Copper Peptide GHK Cu Tripeptide 1 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