GHK CU 100mg 99%+ Purity, COA Verified Copper Peptide Regenerating Serum for Glowing Skin and Hair Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb 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 Therapy in Raleigh, NC