Buckwheat is a plant from the family of Polygonaceae. It contains potassium,
phosphorous, calcium, iron, zinc, vitamins B, E and rutin. Rutin is a bioflavonoid which is used for blood vessels treatment. Obtained results confirm that the highest concentration of rutin is accumulated in leaves and blossoms of the buckwheat plant. Usually, they are the main part of tea mixtures used for vessel diseases treatment. On the other hand, the lowest concentration is in buckwheat products.