Iron (Fe, atomic number 26) is a redox-active transition metal element found in living systems as Fe2+ or Fe3+ ions. It is rarely found free in biology, but is bound to proteins such as ferritin ...

The major micronutrient deficiencies worldwide concern iron, with 24% of the world's population (up to 60% in developing countries) or 1.4 billion women suffering from iron deficiency, anemia ...