Experts warn common mistakes can reduce iron supplement effectiveness

Experts caution that common errors can diminish the effectiveness of iron supplements. They underscore the significance of timing and the avoidance of specific foods and beverages, like coffee, when consuming iron supplements to enhance absorption. Iron supplements are employed to treat anemia stemming from iron deficiency, although they may induce side effects such as nausea, constipation, diarrhea, and stomach pain in certain individuals.

Rachel Woods, an associate professor of medical education at the Universities of Nottingham and Lincoln, elucidates that iron deficiency must be accurately diagnosed and its underlying causes determined prior to initiating supplements. It may stem from blood loss or impaired absorption due to intestinal disorders. Woods highlights that particular beverages, including coffee, markedly diminish iron absorption.

A study encompassing 34 women revealed that consuming coffee alongside iron supplements decreased absorption by 54% compared to water, and absorption decreased by 66% when taken with breakfast. In contrast, vitamin C augmented iron absorption by 30% when 80 mg was ingested, whereas a 500 mg dosage did not confer additional advantages.

The study also indicated that iron absorption was 37% lower in the afternoon as opposed to the morning; however, Woods clarified that this is not a universal phenomenon. A randomized trial involving 440 adults discovered that taking iron in conjunction with vitamin C did not prove more efficacious than taking iron alone in elevating hemoglobin levels and iron stores.

Calcium may likewise influence iron absorption when both are ingested in substantial quantities, albeit a review of studies suggests its long-term effects are minimal. Woods recommends seeking counsel from a pharmacist regarding the timing of calcium and iron supplements. The UK National Health Service advises taking ferrous sulfate approximately 30 minutes before food or two hours thereafter, although it can be taken with food if gastrointestinal discomfort ensues.

Woods emphasizes that consistency in taking supplements is paramount, even if achieving optimal absorption proves challenging if it undermines adherence to treatment. She cautions against taking supplements without a justified requirement or professional guidance, noting that excessive doses of certain vitamins can precipitate health issues, such as nerve damage from surplus vitamin B12 and toxic concentrations of vitamin A. Woods stresses the importance of identifying the cause of iron deficiency, adhering to the prescribed dosage, and exercising caution regarding foods and beverages that may impede supplement absorption.