<prompt> Most of the iron in the diet is in the ferric Fe3 form. It is actively absorbed in:StomachDuodenumLarge intestineIleum  <response>: Gastric secretions dissolve the dietary iron and permit it to form soluble complexes with ascorbic acid and other substances that aid its reduction to the Fe2 form. Almost all iron absorption occurs in the duodenum. Transpo of Fe2 into the enterocytes occurs divalent metal transpoer 1 DMT1. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 26. Digestion, Absorption, Nutritional Principles. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 