Cassia seeds come from the dried mature seeds of the legume cassia or small cassia. Cassia seeds are sweet, bitter, salty and slightly cold in nature, belonging to the liver and large intestine meridians, and belong to the Chinese medicine to clear heat and fire. The effects of cassia seeds are mainly manifested in two aspects: 1, cassia seeds can clear liver fire and brighten the eyes, and can be used for symptoms such as redness and swelling of the eyes, shyness and tears, and darkness of the eyes caused by heat in the liver meridian or wind-heat in the liver meridian; 2, cassia seeds can laxative and laxative, and can be used for constipation caused by hot knots and dryness of the intestines. Modern research shows that cassia seeds have pharmacological effects such as lowering blood lipids and blood pressure, so they are widely consumed in health food, but there is a potential risk of hepatotoxicity when taken in large quantities over a long period of time, mainly thought to be due to the anthraquinone component, so attention should be paid when applied over a long period of time. Now there are also people who take cassia seeds to make pillows, mainly using its ability to brighten the eyes.