GHK Cu Focal Point Vitality GHK cu hard spots at injection site : r Peptides Peptide Injection Reactions: Why Redness and Lumps Happen (And How to Fix Them) GHK Cu Copper Peptides: Topical vs Injectable In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega 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