自从本世纪五十年代后期发现硒有类似维生素E的作用以来,诸多实验都证实了硒是动物必需的微量元素。从而结束了较长时间内人们只认为它是有毒物质的片面认识阶段,取得了“硒是动物保健的必需营养素,超量硒对机体有毒副作用”的重要结论。表明硒具有两重性。 Since the late seventies of this century found that selenium has a similar role of vitamin E, many experiments have confirmed that selenium is an animal essential trace elements. Thus ending a one-sided cognitive phase in which people only consider it to be a toxic substance for a long period of time and has achieved the important conclusion that “selenium is an essential nutrient for animal health care and toxic and side effects of excess selenium on the body”. Selenium shows duality.