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Micronutrient fortification is the public health policy of adding Micronutrients (essential trace elements and vitamins) to foodstuffs to ensure that minimum dietary requirements are met.
Important trace elements such as Iodine can be deficient in foods if the element is absent in the soil. The quantities required are so small however that it can be quite inexpensive to add it to some common product. Iodised salt and iron fortified bread spring to mind.