GHK Cu Blue Copper Peptide Serum Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Jumbo Size 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 Copper GHK+ Facial Serum Peptides Supplement Bonasana Health HK