GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting GHK cu Cosmetic Topical 5x 1g Ampules NEXAPH GHK Cu Copper Peptide Neck & Face Serum 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 Shop GHK CU Topical Foam: Enhance Skin and Hair Health