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 While you sleep, your skin works. Introducing Overnight Rx our prescription grade night treatment formulated with four clinically active ingredients: Tretinoin, Estriol, GHK Cu Copper Peptide, and Niacinamide. Together, they target the signs of Micro Infusion System For Under Eyes Botanique Paris NovaMane Hair Regrowth Micro Infusion System For Women Transform Your Skin with GHK Cu Benefits