Copper Peptide Serum for Face with GHK Cu, Argirelin & Hyaluronic Acid When Jennifer says she didn't know skincare could do this, we felt that. Real results from a real customer using BioGlo's GHK Cu Copper Peptides Serum. Formulated with 2% GHK Cu + Hyaluronic 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 ANAIRUI Copper Peptides GHK Cu Serum Am+Pm 5% B5+GHK Cu Hydrating Serum