Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care GHK Cu Isn't Just for Skin: The Anti Aging Peptide That Works From the Inside Out Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact