Copper Peptides for Skin: A Complete Guide A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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 Peptide Regenerating Serum for Glowing Skin and Hair GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK Cu Peptide Progress: Week 3 Results