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: GHK Cu Copper Peptide Supplement, Anti aging and revitalizing skin, strengthening hair roots: Precision nutrition capsules improve skin elasticity and increase hair density, 90 vegan capsules. : Health & Household Ghk Copper Peptide GHK Cu (10 mg, 50 mg, 100 mg) COA verified peptide Nootropix Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy