GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Advanced GHK Cu Face Cream 2400mg 4% Firmer Skin Neurogan Neurogan Health 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 USA Copper Peptide GHK Cu Powder, DIY Blue Copper for Making the Best Face Cream eBay