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维生素,是若干彼此无关的维持机体正常代谢和生理功能所必需的某些有机化合物的总称。人体缺乏它,就会产生特异的营养缺乏病。维生素具有以下特点;一是天然食物的微量组成成分;二是维持机体健康与生长所必需,每日需要量很小,通常以毫克或微克计算;三是膳食中缺乏维生素或吸收不良时,可产生特异的营养缺乏病;四是机体不能合成或合成数量不能满足生理需要,必须由食物供给。
Vitamins are a group of several organic compounds that are unrelated to each other and are essential for the normal metabolism and physiology of the body. The lack of it, it will produce specific nutritional deficiencies. Vitamins have the following characteristics: First, trace elements of natural foods; Second, to maintain the health and growth of the body necessary daily demand is small, usually in milligrams or micrograms calculation; Third, the lack of dietary vitamin or malabsorption may be Resulting in specific nutritional deficiencies; Fourth, the body can not be synthesized or the synthesis of the number can not meet the physiological needs, must be supplied by food.