GHK Cu (Copper Peptide) Cream 30gm Valhalla Vitality 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 99% Pure Copper Peptides (ghk cu) Great for DIY 1 Gram Etsy Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs