The rutin contained in black buckwheat tea can soften blood vessels, lower blood lipids, blood sugar, blood pressure, lose weight and detoxify, clean up human waste, and activate insulin secretion. It is rich in protein, mineral elements, and 9 essential fatty acids, linoleic acid and other biologically active substances for the human body, which can strengthen the spleen and appetite, and relieve constipation and moisturize the intestines. Long-term drinking is beneficial to health.