Serum for hair use, presented with a creamy and soft texture without silicones that protects against external aggressions that hair suffers daily. The formula contains keratin, which strengthens the hair fiber and protects it from thermal treatments, thus preventing breakage and split ends. In addition, the serum is especially suitable for frizzy hair due to its high content of amaranth oil, which deeply nourishes and leaves hair shiny and silky.