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 Blue Copper Peptide Powerful Trio Wonderlini exquisite skincare Peptide Calculator Cellgenic GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare GHK CU Before and After Pictures Topical GHK Cu Skin Results, Face Serum Reviews & Photo Results Neurogan Health