Copper Peptide GHK-Cu is a naturally occurring copper complex of the tripeptide glycyl-L-histidyl-L-lysine. This tripeptide has a strong affinity for copper(II) and was originally isolated from human plasma. It can also be found in saliva and urine.Overview[edit]Several copper(II)-peptide complexes

Blue copper peptide is also called blue copper peptide and copper peptide. It is a complex of metal copper ion and tripeptide. Because it is rich in copper ions, the appearance presents a unique and elegant blue color, so it is called blue copper peptide.