GHK Cu suppressed the activation of the p38 MAPK signaling pathway in Download Scientific Diagram Peptide Capsules Peptide Science GHK Cu Copper Peptide Twin Pack by Emrald Labs Elite Supps The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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