A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Hard Lump Under Injection Site: Treatment, Causes, and More MyEczemaTeam PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction 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