Fortification. A fortified food simply has vitamins, minerals or other nutrients not normally present in the food added to it during processing. For example, milk does not naturally contain vitamin D, but is often fortified with it because vitamin D enhances calcium absorption.Enriching food differs from fortifying.he vitamins eligible for fortification are A, C, D, E, thiamin, riboflavin, niacin, B-6, B-12, biotin, pantothenic acid and folate. Other eligible nutrients and minerals are protein, calcium, iron, phosphorus, magnesium, zinc, iodine, copper and potassium.