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 Amazon.com: Skin Perfection GHK Cu Copper Peptide Powder 99.7% Pure DIY Copper Peptides Serum for Face and Scalp Cosmetic Grade GHK Cu 1 Gram Creates Up to 100ml for Fuller Hair and Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare Male Hair Restoration Before & After with PRF and GHK Cu GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration