Arugula is an excellent source of vitamin A to maintain healthy organ functioning and vitamin C to strengthen the immune system while reducing inflammation. The peppery greens also provide calcium to protect bones and teeth and lower amounts of folate, iron, vitamin K, copper, zinc, and magnesium. In addition to vitamins and minerals, Arugula contains glucosinolates, which are compounds believed to have detoxifying properties and also give the leaves their pungent, slightly bitter flavor.