GHK Cu Peptide: The Ultimate Skin & Hair Regeneration Cellular Glow Copper Peptide GHK Cu Serum for Face Neurogan GHK Cu (Copper Peptide) Neck & Face Serum Barbados Ubuy GHK Cu (50 MG) Sigma Compounds 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 & Hair Growth Support, Improves Skin Elasticity & Firmness, Thicker, Fuller Hair, Easy Absorption, Precisely Dosed, 90 Vegan Capsules : Health & Household