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