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 GHKCu 50mg High Purity, U.S. Made Research Peptides OROS Research What Are the Benefits of Copper Peptide Ghk Cu Powder for High Performance Skincare Brands? Hongda Phytochemistry GHK Cu Dosage for Hair Growth and Skin Rejuvenation