Enzo Keratin Hair Serum Is A Luxurious Serum That Smooths Frizz And Leaves Hair Luminous, Never Greasy. Suitable For All Hair Types Prone To Frizz. Enzo Keratin Hair Serum Is A Keratin Blowout That Penetrates The Hair Shaft And Flattens Cuticles, Giving You Soft, Silky, Frizz-Free Locks That Are Perfect For All Occasions. Rub A Small Drop Into Your Hands (A Little Goes A Long Way), Then Work Through Damp Or Dry Hair.