Vitamin R or rutin is a flavonoid that does a lot for our body. More correctly call vitamin P, or rutin, not a flavonoid, but a bioflavonoid, a substance that slows down the aging process. Rutin is able to improve the permeability of capillaries, to prevent their fragility. It can also help people to be healthy and active. Rutin is found in a variety of foods and herbs, but its effect on the body is ambiguous.