GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? GHK Cu Revival Clinic 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 GHK Cu for Skin & Wound Healing: Current Evidence Meeting Point Health GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age