What is the proper use of peptide GHK Cu (Glycyl Histidyl Lysine Copper) for wound healing or skin regeneration? GHK Cu Copper Peptide Injections: Advanced Skin Rejuvenation Ever heard of GHK Cu peptide? It's a naturally occurring copper peptide that helps repair tissue, stimulate collagen, and support skin healing. When used in injectable form, it works at a deeper level Amazon.com: GHK Cu Copper Peptide Supplement, 120mcg High Purity Supplement for Skin & Hair, Enteric Coated for Maximum Absorption, Vegan & Gluten Free (60 Count) : Health & Household