Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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 How to Make a DIY Hair Peptide Serum Recipe MAXXING. Coming soon., Every product we make lists the exact percentage of every active ingredient on the label., No proprietary blends. No peptide complexes hiding the dose. No fairy dust., 5%