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 Peptides Serum, Copper Peptides Serum for Face Tightening, Repairing, Collagen Boosting with Hyaluronic Acid Fragrance Free TikTok Shop GHK CU Apollo Peptide Sciences GZ GHK CU Face Cream Copper Peptide Skin Repair Anti Aging Firming Hydrating Regeneration Cream