Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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 GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution GHK Cu for Skin: SIGNAL's Guide to Rejuvenation Cellular Glow Copper Peptide GHK Cu Serum for Face Copper Peptides Serum for Face 2% GHK CU & 4% EGF