This video by Dr. Thomas E. Levy illustrates that the nutrients present in your “enriched” foods may not be as nutritious as you thought. Manufacturers of cereals are allowed to use indigestible iron filings in breakfast cereal. These cereal products can be dangerous for children and all patients with inflammatory diseases.
Unfortunately, this ignores the scientific fact that hydrochloric acid [as found in the stomach] reacts with iron to create Fe2+ ions which ARE bioavailable; and indeed, if an iron salt was used in the cornflakes, there would be the likelihood of oxidation to Fe3+ which is poorly bioavailable and needs vitamin C to convert it back to useable iron.
But one should never let the facts get in the way of a good story…