How to Mitigate GHKCU Burn and Stinging Effectively Subcutaneous Injection: What It Is and How to Give One For those of you that take ghk cu, why is this so bad? It's never been this bruised. But is always swollen, red, and burns like hell. I can only tolerate every other 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 Peptide Therapy for Pain Management and Healing Core Medical & Wellness Injection Site Pain Genoskin