Hard Lump Under Injection Site: Treatment, Causes, and More MyEczemaTeam Subcutaneous Injection Sites and Instructions for Safe Self Administration GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age 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 GHK CU Apollo Peptide Sciences GHK CU, Why this audio? Because injecting feels like a constant wasp sting so it takes me about 15 seconds to pin .2 mL. I dread this shot every night for that reason. Also, it leaves me bruised, so I