Iron Supplementation Guidelines

Understanding Iron Content

Iron bisglycinate contains approximately 25 mg of elemental iron per tablet, which is significantly less than other common iron preparations, such as ferrous sulfate, ferrous fumarate, and ferrous gluconate 1, 2
Ferrous sulfate (325 mg) contains 65 mg of elemental iron, ferrous fumarate (325 mg) contains 108 mg of elemental iron, and ferrous gluconate (325 mg) contains 35 mg of elemental iron 3, 4, 5
Polysaccharide-iron complex provides 150 mg of elemental iron per daily dose 3, 4, 5

To achieve 150 mg of elemental iron, approximately 6 tablets (600 mg) of iron bisglycinate are required, and to achieve 200 mg of elemental iron, approximately 8 tablets (800 mg) of iron bisglycinate are required 3

Standard oral iron supplementation should provide 200 mg of elemental iron per day for adults, divided into 2-3 doses, according to the American Journal of Kidney Diseases 3, 4, 5
For pediatric patients, the recommended dose is 2-3 mg/kg/day of elemental iron, as suggested by the American Journal of Kidney Diseases 3, 6
Iron absorption is improved when taken without food or other medications, and food consumed within 2 hours before or 1 hour after an oral iron supplement can reduce absorption by up to 50% 3, 6
Tea and coffee are powerful inhibitors of iron absorption and should not be consumed within an hour after taking iron, as reported by the Clinical Gastroenterology and Hepatology 2
Aluminum-based phosphate binders can reduce iron absorption, according to the American Journal of Kidney Diseases 3, 6

If oral iron is not tolerated or effective, intravenous iron should be considered, especially in cases of severe anemia, malabsorption, or active inflammatory bowel disease, as recommended by the Clinical Gastroenterology and Hepatology 1, 2
For patients with difficulty tolerating oral iron, strategies include smaller more frequent doses, starting with a lower dose and gradually increasing, trying different formulations, or taking supplements at bedtime, as suggested by the American Journal of Kidney Diseases 3, 6