GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic Wellness peptide craze: why people are injecting drugs 'not for human consumption' GHK Cu Colombia Research Dosing & Skin Recovery Guide Poly Biotech 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