Bioavailability of zinc oxide added to corn tortilla is similar to that of zinc sulfate and is not affected by simultaneous addition of iron.
Rosado JL, D?az M, Mu?oz E, Westcott JL, Gonz?lez KE, Krebs NF, Caama?o MC, Hambidge M. Bioavailability of zinc oxide added to corn tortilla is similar to that of zinc sulfate and is not affected by simultaneous addition of iron. Food Nutr Bull. 2012 Dec; 33(4):261-6.