FUNCTIONS There are various physiological functions of rutin and related flavonoids in the human body and other species, including plants. Rutin is one of the best natural antioxidants in the known natural class. Rutin is synthesized in higher plants, and it was found in various fruits and fruit rinds, especially citrus fruits and berries such as Ruta graveolens and Morus alba . Rutin is also called vitamin P, which is widely distributed in vegetables, fruits, and medicinal herbs such as asparagus and buckwheat. Further, buckwheat (Fagopyrum esculentum) is considered to be one of the best dietary sources of rutin. Rutin has various pharmacological activities such as antibacterial, antiprotozoal, antitumor, antiinflammatory, antiallergic, antiviral, cytoprotective, vasoactive, hypolipidaemic, antiplatelet, antispasmodic, and antihypertensive. Rutin is used in food in different forms such as colorant, antioxidant, preservative, stabilizer, and UV absorbent. It is also used as an active component in various herbal medicines, multivitamin preparations, the cosmetic and chemical industries, and in animal feed.