Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference 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 Copper Peptide, Face Cream, 2 oz (60 ml) GHK Copper Peptide GHK Cu Tripeptide 1