GHK Cu Peptide Dosage How to Use Copper Peptides, Injections Neurogan Health 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper 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