The castor bean is toxic, and the raw castor bean is more toxic when it is mashed and soaked in water. Ricinus communis contains ricin and ricinine, which can be poisoned to death by taking 2-7 castor beans. Ricin may be a proteolytic enzyme, and 7 mg can kill adults. Castor seeds should not be eaten raw or cooked to prevent food poisoning. Because castor seeds can stimulate gastrointestinal mucosa, make blood cells agglutinate and hemolyze, leading to liver and kidney necrosis and nerve paralysis. After eating castor seeds, symptoms such as vomiting, diarrhea and bleeding may occur, and in severe cases, symptoms such as dehydration, shock, coma and convulsion may occur. If the treatment is not timely, heart failure and dyspnea may occur in 2 ~ 3 days.