Chinese name: Vitamin A English name: Vitamin A CAS: 68-26-8 Purity Specification: 99% Product category: food additives Vitamin A is mainly used for the prevention and treatment of night blindness, dry eye disease, and also for the local suppurative infection of the skin after burns. The intake of vitamin A should not exceed 3mg / day in adults and should not exceed 2mg / day in children. If you take a high dose of vitamin A, acute vitamin A overload will occur because the discharge ratio is not high. The main symptoms are short-term hydrocephalus and vomiting, and some symptoms can have headache, drowsiness and nausea. Children after long-term high-dose use of vitamin A, there will be excessive vitamin A symptoms, mainly liver and spleen hepatomegaly, reduced red blood cells and white blood cells, excessive bone marrow growth and brittle long bones, prone to fracture. Middle-aged men with high levels of vitamin A in their blood have a much higher risk of developing bone fractures in their old age, according to a new study in Sweden. Therefore, to the human body, vitamin A is indispensable, but also can not be abused, as long as the diet is rich in vitamin A or carotene food, you can effectively prevent vitamin A deficiency, without taking additional vitamin A supplements.