Rehmannia glutinosa is cool. If you eat too much, it will lead to diarrhea. Dried rehmannia slices can be used to make tea. It tastes good. It can quench thirst and dispel fire, nourish kidney and moisten lung, protect liver and tonify yin deficiency. , but it must be moderate. When making tea, you can put up to 3 to 5 tablets with hot water.