柠檬酸铁铵的功效和作用是什么？

Ammonium ferric citrate has the formula (NH4)5Fe(C6H4O7)2. A distinguishing feature of this compound is that it is very soluble in water, in contrast to ferric citrate which is not very soluble.In its crystal structure each citric acid moiety has lost four protons, and the deprotonated hydroxyl groups act as ligands together with four carboxylate groups; two carboxylate groups are not coordinated to the ferric ion.柠檬酸铁铵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:
改善营养性贫血,增强免疫力,其中在力保健牌伊人装保健饮料,999牌养血美调理液,华度益血胶囊,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。