GHK Cu Copper Peptide Collagen, Skin Rejuvenation & Hair Restoration Injectable GHK Cu: Beginner's Guide to Copper Peptide 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 Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B