硒酸钠的功效和作用是什么？

Sodium selenate is the inorganic compound with the formula Na 2SeO 4, not to be confused with sodium selenite. It exists as the anhydrous salt, the heptahydrate, and the decahydrate. These are white, water-soluble solids. The decahydrate is a common ingredient in multivitamins and livestock feed as a source of selenium. The anhydrous salt is used in the production of some glass. Although the selenates are much more toxic, many physical properties of sodium selenate and sodium sulfate are similar.硒酸钠在具有以下功能的保健食品中使用过该原料（注：不代表该原料本身具有以下保健功能）,具有如下功能:
增强免疫力,缓解体力疲劳,祛黄褐斑,对辐射危害有辅助保护功能,促进排铅,辅助降血脂,辅助降血糖,对化学性肝损伤有辅助保护功能,抗氧化,缓解视疲劳,提高缺氧耐受力,增加骨密度,辅助改善记忆,其中在宝健牌多种维生素矿物质片,乐奔拓R多种维生素矿物质咀嚼片（玫瑰味）,乐奔拓R多种维生素矿物质咀嚼片（柠檬味）,中就有使用过该原料.
说明：以上对于原料功效的说明仅来源于其在对应保健食品中的运用，不代表该原料本身具有以下保健功能。