GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link GHK Cu Copper Peptide: The Ultimate Peptide For Longevity Unlocking the Secrets of GHK Cu: The Revolutionary Peptide for Youthfu 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