GHK Cu Copper Peptide Neck & Face Serum Copper Tripeptide 1 Copper peptide GHK Cu Cosmetic Ingredients Guide Not all copper peptide serums are created equal And this is where a lot of people get confused. You'll see copper peptides on the label and expect amazing results but the GHK Cu Peptides: Unlocking the Copper Peptide Revolution in Skin Care Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000