NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL GHK Cu (10 mg, 50 mg, 100 mg) COA verified peptide Nootropix Fitish Most people don't know GHK Cu by name. Their face does. It's the peptide your body uses to signal collagen production, repair tissue, Instagram GHKCu Copper Peptide Therapy Skin & Healing Regeneration 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