Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget GHK Cu Peptides Serum TryDeloura Why is GHK delivery challenging? Injectable forms are not approved worldwide safety risks if self injected Topical creams & serums cannot penetrate deeply most GHK stays on skin surface