Buy GHK Cu Peptide Vial Peptide Works The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne Copper in Zebrafish 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