Copper Peptides for Skin: A Complete Guide GZ GHK Cu Copper Peptide for Skin Regeneration & Aging 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 GZ GHK CU Face Cream Copper Peptide Skin Repair Anti Aging Firming Hydrating Regeneration Cream Before & After Mirror Skin 1% GHK Cu Copper Elixir Serum #mirrors TikTok