There are more than 500 kinds of aloe, but only a dozen of them can be used as medicine and few can be eaten. Aloe vera and Aloe vera cultivated by Shanghai Agricultural College can be eaten, but Aloe vera, as an ornamental plant, cannot be used as medicine or eaten, such as Aloe vera and Cui Hua palm. Aloe vera, which is eaten as a vegetable, still has a certain limit and must be peeled. Professor Yang Jianrong from the Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences reminded that the current research shows that aloe vera has the function of clearing away heat and toxic materials, and it does have its unique effects in anti-cancer and beauty. However, different varieties of aloe have great differences in medicinal properties and efficacy, and people with different constitutions will have different effects when using aloe. Aloe emodin contained in aloe has the function of "relaxing bowels", and if you eat too much, you will have diarrhea. People with weak constitution and children who eat too much may have allergic reactions, red skin, rough skin, and even nausea, vomiting, diarrhea and other symptoms. Aloe vera can make women's internal organs congested and promote uterine movement. Pregnant women and menstruating women are prone to abdominal pain, bleeding or massive bleeding. Patients with hemorrhoid bleeding and nosebleeds should not take aloe either, otherwise it will lead to the deterioration of their condition. According to the prescription of traditional Chinese medicine, the oral dose of aloe should not exceed 5g, and the toxic dose is 9- 15g. Poisoning symptoms usually appear within 8- 12 hours. Mild symptoms of digestive system, such as nausea, vomiting, severe diarrhea, abdominal pain, diarrhea and hemorrhagic gastritis. Poisoning can cause acute nephritis.