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, A lot of people asked how I use GHK Cu (copper peptide) with a pen device, so here's a quick tutorial showing exactly how I do it. In this video I show how GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B