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 Intra Nasal Spray 50 mg 0.34 oz. Westend Medical Supply GHK CU vial dosage question : r PeptidePathways GHK Cu and Reproductive Health: Mechanisms, Fertility Benefits Subcutaneous Injection Sites and Instructions for Safe Self Administration