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 GHK Copper Peptide 99.7% Pure Powder for DIY Face and Hair Serums 1 gram jar TikTok Shop Advanced GHK Cu Face Cream 2400mg 4% Firmer Skin Neurogan Neurogan Health