Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact 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 GHK Cu for Men: Supporting Hair Vitality and Skin Appearance Eden GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect