Copper Peptides for Skin: The Science, Benefits, and Best Practices Hubmed 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 do glow peptides burn or sting after injection?, If youre using GHK Cu, BPC 157, or TB 500 for skin health, hair, or tissue repair, this is a common question and usually not a problem., Glow GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes