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 for Sale Tripeptide 1 3rd Party Tested US Made GHK Cu Peptide Regenerative & Cosmetic Research GHK CU 50mg Peptify GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy