If your GHK Cu or MOTS C injection leaves welts and burns like a hornet, it's usually not the peptide it's the technique. A few small tweaks can turn a sting into almost Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia GHK Cu Peptide: What It Does for Body Composition and Metabolic Health