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 Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B