Shop our GHK CU Peptides Copper Peptide (GHK Cu) 2% Recovery Serum 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 does Glycyl Histidyl Lysine Copper (GHK Cu) cause pain or discomfort? If you're using GHK Cu and it stings a little (which is common) this one's for you In this reel I'm sharing the small tweaks that have helped me make peptide injections