The dried and mature seeds of the leguminous plant Cassia obtusi folia L or Cassia tora L. Cassia seed is rich in chrysophanol, emodin, cassia and other ingredients. It has antihypertensive, antibacterial and cholesterol-lowering effects. It can clear liver fire, relieve liver heat, laxative, relieve internal heat, promote the excretion of toxins, diuresis, and lower blood lipids.