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 50mg 10mL Vial: Automatic Refills Celia Health Injectable GHK Cu: Beginner's Guide to Copper Peptide GHK Cu: Effective Anti Aging Skincare Ingredient Nugenyx GHK CU 50 mg LIVV Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay