Hair serum is rich in oils and nutrients from argan, olive, and wheat germ. It is a liquid treatment, usually composed of silicone, that provides a protective layer to the hair, helping to smooth the hair. This non-greasy formula is instantly absorbed into your hair giving it a fantastic shine. While also helping to eliminate split ends, frizz, and breakage. It relieves dryness and gives your hair a luster all day long.