Copper Peptides Serum for Face 2% GHK CU & 4% EGF CP Serum Before their use in skincare, Copper Peptides were originally introduced in wound healing research. Listen to the sounds of copper peptides and stay tuned to learn more GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) GHK Cu Copper Peptide Anti Aging Serum Collagen Boosting Skincare Prakash Organics GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution