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 The Hidden Risk of Reusing Pen Needles GHK Cu (Copper Peptide) Provider Supervised Therapy IV Glow Bar Peptides for Longevity: BPC 157, TB 500, GHK Cu & CJC 1295 Can You Use the Same Syringe Needle Over and Over? SyringesNeedlesDepot