GHK Cu Isn't Just for Skin: The Anti Aging Peptide That Works From the Inside Out 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 Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz The Complete Peptide Guide: Reconstitution, Injection & Storage Extension Health