Pomegranate is a tree. Various parts of the tree and fruit are used to make medicine. The pomegranate is a rich source of natural antioxidant compounds that help your body rid itself of free radicals, which form during digestion or after you're exposed to toxins. The pomegranate is a fruit that contains hundreds of edible seeds called arils. They are rich in fiber, vitamins, minerals, and bioactive plant compounds, but they also contain some sugar.