Copper, Collagen, and Controversy: Inside the GHK Cu Buzz 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 Cosmetic GHK Cu (Copper Peptide) 99% Purity 1g Royal Peptides Cosmetic Grade Ahk cu + Ghk cu Powder Copper Tripeptide 1 Blue Copper Peptide GHK Copper 1g Tube Ghk cu Copper Peptide