GHK CU Cream 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 may be trending, but it's nothing new to us. We have been using GHK Cu (our Copper Peptide Complex) for over 15+ years post treatment and in your dialy routine. #GHKCu #CopperPeptides # GHK Cu: The Elegant Copper Peptide for Skin and Scalp Renewal Renew Vitality