GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy 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 Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. GHK Cu Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline