Copper Peptide (GHK Cu) 2% Recovery Serum How Often to Inject GHK Cu PeptidesExplorer 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 Copper peptide questions we get asked all the time How often should you use it? Do you need to avoid the sun? If you're new, start once daily ( evenings are great), GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu