GHK who? Meet GHK Cu, the copper peptide known for supporting collagen production, skin repair, and a healthier looking glow. A small peptide with big skincare benefits. GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper 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