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 Whitening GHK CU Copper Peptide Serum for All Skin Types Advanced GHK Cu Copper Peptide Serum 1% (300mg 30 ml (Pack of 1) GHK CU Peptide Serum Nanoskin Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with