Copper Peptides Before and After: Visible Skin Improvements Explained Hubmed Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms GHK Cu Copper Peptides: Topical vs Injectable Mitigating GHK Cu Injection Pain: Tips and Tricks Gabriel Alizaidy, MD, MS posted on the topic LinkedIn 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 benefits, you need to If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection