Cassia seed is bitter and slightly cold. Shennong's Classic of Materia Medica states that it has the function of "treating green blindness, red eyes, pain and tears", and it is a commonly used medicine for clearing liver, improving eyesight, promoting diuresis and relaxing bowels. According to modern pharmacology, it contains chrysophanol, emodin, cassia seed and other ingredients, and has the functions of lowering blood pressure, resisting bacteria, relaxing bowels and lowering cholesterol. Cassia seed is an important medicine in ophthalmology of traditional Chinese medicine, which is suitable for liver heat. It can also be used with Prunella vulgaris, Mulberry Leaves and Chrysanthemum. Famous ophthalmic prescriptions such as cinnamon pill and cinnamon powder can be found in prescriptions of past dynasties. Cassia seed also has the function of stopping diarrhea, which is very suitable for the elderly because of heat accumulation constipation, yin deficiency and intestinal dryness, and has the reputation of diarrhea without hurting vital qi. For headache and dizziness caused by hyperactivity of liver yang, Cinnamomum cassia, Chrysanthemum and Uncaria rhynchophylla can also calm the liver and lower blood pressure. Tea substitutes are good for health. The diary flies at night. It's not good eyes, just because I wear them all the year round. "Micro-fried cassia seed is a convenient prescription for health care for the elderly. Put it in a cup of 10g~20g and soak it in boiling water. Yellow fragrance, bitter taste, unique flavor. People with high blood pressure and habitual constipation may wish to try it. A glass of cassia seed tea may bring you health and happiness. People with weak spleen and stomach can't take it for a long time. Huang Tingjian, a writer who made pillows in the Song Dynasty, wrote a poem: "Pillow bags replace elbows, and I would like to sleep and listen to incense. Old eyes are willing to be idle, and reading is really addictive. " The poet praised Gui Pillow for its functions of clearing away heat, calming nerves, improving eyesight and helping sleep. The Tang Dynasty's "Daming Materia Medica" said: "Make a pillow, cure the head wind, and improve your eyesight over black beans. "Cinnamon and chrysanthemum are mixed together. Sleep happily. In the Qing dynasty, eating Guangqun Fangpu said: "Order tea for you, and the leaves of Miao can be used as wine yeast. "Ru is the floorboard of vegetables. The tender seedlings, leaves and tender fruits of cassia seed are edible. Its leaves are very fragrant after being baked with fire. Ordering tea means making "boiled water", which is a popular health drink in the Song Dynasty. Raw cassia seed is used as a pillow for external use.