GHK Cu Copper Peptides: Topical vs Injectable GHK Cu Face Serum 1200MG Lab Tested & High Potency Neurogan Health 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 you're Experiencing itching & burning from your GHK CU peptide injections? Try these to hacks:, 1. Use a longer syringe to penetrate deeper into the fat cells. , 2. Dilute the copper. Here I show you how to