Rutin is a bioflavonoid related to quercetin and hesperidin found in both citrus and non-citrus fruits, as well as other foods such as buckwheat. Rutin is a powerful combatant of free radicals and promotes a healthy inflammatory response. It is best known for its role in the maintenance of cardiovascular health.* NOW&ampreg; Rutin is vegetarian and derived from a non-citrus source.