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 GHKCu Copper Peptide Therapy Skin & Healing Regeneration The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu 99%+ Pure Peptide Amino Club Amino Club GHK cu MCCM Medical Cosmetics GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia