维生素为人类生活所必需。缺乏某种维生素就会引起一些疾病发生。但是,健康人在正常饮食的情况下,很少发生维生素缺乏症,故无须补给维生素制剂。任何一种维生素的补给只是补充身体缺乏的部分,而不应把维生素制剂当作无害的营养食品无限制地应用。过名的补给不但浪费而且有害,尤其维生素A、D Vitamins are necessary for human life. Lack of vitamins can cause some diseases. However, healthy people in the case of normal diet, vitamin deficiency rarely occurs, so there is no need to supply vitamins. The supply of any one vitamin is only a part of the body to add to the lack of vitamins should not be used as a non-harmful nutritional food unlimited use. Notorious supplies not only waste and harmful, especially vitamins A, D.