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 Welltech Collagen Peptide Copper GHK Capsules Elite Supps Amazon.com: QUBIT GHK Cu Copper Peptide Supplement for Skin & Hair, Easy to Absorb, Precisely Dosed 90 Vegan Capsules : Health & Household GHK Cu: The Elegant Copper Peptide for Skin and Scalp Renewal Renew Vitality GHK Cu Topical Spray Wells Pharmacy Network