GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B 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 Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime GHK Cu Peptide Benefits (And a Few Risks) Explained Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Jumbo Size