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 Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule How Long Does GHK Cu Take to Work? GHK Cu Timeline Neurogan + Health GHK CU Copper Peptide 120 MCG Tablets PrettyStick The Blue Revolution: Why 1% Pure GHK Cu is the New Standard for Mature Pure & Cimple