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 Copper GHK+ Facial Serum Peptides Supplement Bonasana Health HK Best GHK Cu Peptide Cream Texas InjectCo Aesthetics Best Repairing Blue Copper Peptide Serum Anti Wrinkle Skin Face Ghk Cu Peptide Blue Copper Peptide Serum and Ghk Cu price Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin