USA Copper Peptide GHK Cu Powder, DIY Blue Copper for Making the Best Face Cream The Blue Revolution: Why 1% Pure GHK Cu is the New Standard for Mature Pure & Cimple The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow