Amazon.com: Copper Peptides Serum For Face (Plant Stem Cell Serum for Face) Full Size:1.0oz 30ml : Beauty & Personal Care Cosmetic Skin Solutions Copper Peptide 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 GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has GHK Cu Copper Peptide Neck & Face Serum