Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum 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 Copper Peptide Collagen Boost & Skin Regeneration Calibrate Hydration Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support