碘被公认为是人体必需的微量元素，是人体不能合成，当机体摄入不足时可引起功能受损；而补充到生理水平时，又有预防或缓解这一损伤作用。缺碘时，机体既不能生长，又不能完成其生命周期，所以，它对机体正常代谢和生长发育是必不可少的，也是不能被其他任何元素所取代的。但 Iodine is recognized as essential trace elements, is the human body can not be synthesized, when the body can not afford to intake of impaired; and added to the physiological level, but also to prevent or alleviate the damage. When iodine deficiency, the body can neither grow nor complete its life cycle, so it is essential for the body’s normal metabolism and growth, but also can not be replaced by any other element. but