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 The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Peptide Injection and GHK Cu Benefits, Uses ,safety Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit