GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration GHK Cu Copper Peptide Serum with Hyaluronic Acid, Deep Hydrating Nourishing Facial Serum 30ML Gentle Anti Aging Skincare for All Skin Types, Firming & Smoothing for Men Women TikTok Shop 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 GHK Copper Peptide GHK Cu Tripeptide 1