Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum GHK Cu Injectable GHK Cu: Beginner's Guide to Copper Peptide 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),