GHK Cu Peptide Research Compound USA 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 GHK CU COPPER PEPTIDES TABLETS The Beauty Doctrine How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week? GHK Cu Peptide Regenerative & Cosmetic Research