Before you decide to begin using the copper peptide, GHK Cu, be aware it stings and leaves behind big, red welts that then leave a lovely bruise. In order to reap the 'glow' GHK Cu Peptide Benefits for Skin and Hair LIVV Natural Glow Peptide Injection: Revolutionizing Skin Rejuvenation Hubmed Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? GHK Cu is a fantastic peptide but it can burn or bruise some people. Quick options to help reduce that issue. #ghk cu #copperpeptides #KLOW #GLOW #peptides