GHK Copper Peptide GHK Cu Tripeptide 1 2pcs) Advanced Copper Peptide Hair Regrowth Formula GHK CU & AHK CU, Copper Peptide Hair Growth Serum for Women and Men on OnBuy Next up in our peptide highlight series is GHK Cu. If skin support, hair health, and healthy aging are part of your goals, this is one worth knowing about. GHK Cu is a copper 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