Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Mayraki Hair Growth Serum Intense with Copper Peptide GHK Cu Hair Growth Serum for Woman and Man, Hair Growth Oil, Hair Regrowth Treatment, Hair GHK CU 100mg Cellgenic 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