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 Sonora Supply Co. Copper Peptides for Hair Growth Ultrastrong 10% GHK Cu Copper Peptide Serum for Hair with 7x Absorption MADE IN USA Struggling with hair thinning or shedding? Meet GHK Cu, the topical peptide everyone is talking about and NO, it's not an injection! This powerful serum helps: Reduce shedding Copper Peptide (GHK Cu) 2% Recovery Serum