How to Measure and Inject GHK Cu (Copper Peptide for Skin and Tissue Repair) YouTube 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 Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne Copper in Zebrafish