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 and Erectile Dysfunction: What the Evidence Actually Shows GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution GHK Cu is one of my true non negotiables for skin health at any age GHK Cu supports collagen production, calms inflammation, strengthens the skin barrier, and protects cells long before damage becomes