Absorption of zinc sulfate, methionine, and polyascorbate in the presence and absence of a plant-based rural mexican diet

Using the zinc tolerance test, we compared the absorption of zinc from zinc methionine with that from zinc sulfate or zinc polyascorbate. Nine adults received 25 mg of elemental zinc in the three different supplements, either alone in a water solution or added to a standard meal (SM). All subjects were also studied with water alone and the SM alone, as controls. The SM contained plant foods that are habitually consumed in rural Mexico. When the...