GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia Understanding Topical GHK Cu Peptide Benefits for Skin Rejuvenation in Maryland Preston's Pharmacy 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 Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare