ABSTRACT Caulerpa lentillifera is one of the green seaweeds that has the potential as a source of antioxidants. The content of bioactive compounds in C. lentillifera consists of saponins, flavonoids, phenols and alkaloids. This study was aimed to determine the total flavonoid phenolic compounds and saponins, and the antioxidant activity of C. lentillifera extract. The research method used …