Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care HAIRgevityPro Healthgevity Gloss Hair Growth Shampoo with GHK Cu Copper Peptides VANI T Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience Non Greasy Hair Regrowth Serum and Spray, Whats in it ? , GHK CU peptide , promotes hair growth, increases hair thickness, and reduces thinning by stimulating follicle activity, enhancing scalp