GHK Cu Copper Peptide 0.5% (topical foam) 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 Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting 99% Pure Topical Beauty Peptide Ahk Cu Copper Peptide Ghk Cu CAS 49557 75 7 Anti Hair Loss Ahk Cu Anti Aging Peptide Ghk Cu Ghk Cu, Peptide Ghk Cu Made in China.com