Nutritionally buckwheat provides vitamins B1 and B2, several minerals, and nearly twice the amount of proteins found in rice. Rutin, a kind of bioflavonoid that includes the catechins of green tea and the polyphenols of red wine, is not found in other grains or beans, but is contained in great quantity in buckwheat. This bioflavonoid strengthens capillaries and so helps people suffering from arteriosclerosis and high blood pressure. Recent studies indicate that rutin is also a powerful antioxidant that fights free radicals, which are responsible for many cancers.