Which iron supplement contains the highest percentage of elemental iron?

Carbonyl iron is recognized for containing the highest percentage of elemental iron compared to the other supplements listed. Elemental iron refers to the actual amount of iron available in the supplement that can be absorbed by the body.

Carbonyl iron typically provides around 98% elemental iron, making it highly efficient for correcting iron deficiency. This high percentage means that a smaller dose can achieve the desired iron intake, which may make it preferable for some patients.

In contrast, ferrous sulfate contains approximately 20% elemental iron, ferrous gluconate about 12% elemental iron, and ferric ammonium citrate has an even lower percentage. While these supplements can effectively address iron deficiency, they do not provide as much elemental iron per dose, which can necessitate larger doses to achieve similar results. This is crucial for clinical decision-making, particularly for patients who might need to maximize their iron intake efficiently.