GHK Cu (copper peptide) is best known for skin, hair, and tissue repairits a naturally occurring peptide in your body that plays a role in healing and regeneration. In simple terms, its a repair + 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 Advanced GHK Cu Neck & Face Serum Premium Quality Neurogan Health GHK Cu Topical Cream