GHK Cu Copper Peptide Neck & Face Serum GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy 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 Apex Peptide Supply GHK CU for Sale Tripeptide 1 3rd Party Tested US Made GHK Cu 200MG (Topical) Raw Amino