GHK Cu Copper Peptide Neck & Face Serum Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches 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 GHK Cu GHK CU ACETATE Topical Foam Compounded Your skin heals better when your barrier is strong. Topical GHK Cu peptide helps support that process