GHK Cu for Skin Rejuvenation WeCare Pharmacy GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Here's how it helps the skin, in practical terms: 1. Boosts collagen & elastin GHK Cu signals your skin Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Polar Peptides HALAL Grass Fed Beef Tallow Ghk Cu Peptide Cream for Anti Aging