Iron preparations are used to prevent or treat iron deficiency anemia. Oral iron preparations contain different amounts of elemental iron. Dosing is based on elemental iron quantity. Overall there is no iron Ferrous Gluconate vs. Ferrous Sulfate: What's the Difference? Oral iron supplementation in iron deficient women: How much and how often? ScienceDirect Iron absorption from supplements is greater with alternate day than with consecutive day dosing in iron deficient anemic women Haematologica Vitamatic Ferrous Fumarate 325 mg + Vitamin C 100 mg (104 mg Elemental Iron) High Potency Iron Supplement Gentle on Stomach, 120 Tablets, Made in USA