Jujube fruits have long been used in alternative medicine to treat insomnia and anxiety. Animal and test-tube research shows that the fruit can provide impressive health benefits for your nervous system, immunity and digestion. Jujube fruits are rich in several antioxidant compounds, especially flavonoids, polysaccharides, and triterpenic acids. They also contain high levels of vitamin C, which also acts as an antioxidant. An animal study found that the antioxidant effects of jujube flavonoids helped reduce the liver’s stress and inflammation caused by free radical damage.