GHK Cu Copper Peptide Collagen Boost & Skin Regeneration Calibrate Hydration Peptide GHK CU Cream Concierge MD 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 Cu Peptide Serum Copper Peptide Serum for Tightening, Collagen Boosting & Hydrating Topical GHK Cu with Hyaluronic Acid TikTok Shop