Vitamins and minerals can be added to enrich (replace nutrients lost in processing) or fortify (add nutrients not normally present) foods to improve their nutritional quality. Bread sand cereals are usually enriched with some B vitamins and iron. Common examples offortification include the addition of vitamin D to milk, vitamin A to margarine, vitamin C to fruit drinks, calcium to orange juice, and iodide to table salt.
--P. Insel and W. Roth, Core Concepts in Health