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 Absence of evidence isnt evidence of absence its a popular argument, but its not how we should be guiding treatment decisions. In this short, I respond to a comment about GHK Cu injections for Definitive Guide on Peptides for Skin and Hair Care Infusion Clinic ABQ GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Amazon.com: GHK Cu Copper Peptide Supplement, Anti Aging & Hair Growth Support, Improves Skin Elasticity & Firmness, Thicker, Fuller Hair, Easy Absorption, Precisely Dosed, 90 Vegan Capsules : Health & Household