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Symptoms of iron deficiency anemia often ease sooner, within a week or month. Other research suggests that intermittent iron supplementation (as opposed to daily) may bring the same benefits with fewer side effects. Higher amounts are usually spread across two daily doses for better absorption. Iron absorbs best on an empty stomach, but taking it this way can create digestive upset

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It involves testing for methylmalonic acid, which is higher than normal when people have vitamin B12 deficiency