Peptdeo de Cobre GHK Cu: Srum Caseiro para Pele e Cabelo Etsy Portugal GHK Cu Copper Peptide Serum Anti Aging Face Serum for Skin Firming, Wrinkle Reduction, Hydration & Collagen Boosting, 30ml(1 fl oz) : Amazon.es: Belleza A Guide to Needle and Syringe Choices 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,