All About GHK Cu Peptide More Than Just Cosmetic 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, GHK Cu: The Glow Peptide Supporting Skin, Hair, and more Copper Peptide Benefits: Exploring GHK Cu and Copper's Skin Care Effec Aseir Custom GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution