The main component of black tartary buckwheat tea is rutin, also known as vitamin P, which has the main functions of softening blood vessels, improving microcirculation, clearing away heat and toxic materials, promoting blood circulation and removing blood stasis, detoxifying and promoting granulation, lowering blood sugar, urine sugar and blood lipid, invigorating qi and refreshing. If there is fire in the body, it is also good to drink tea to get rid of it.