Iron is required to prevent and treat anemia, but two iron supplements failed to pass ConsumerLab.com's independent testing. One "high potency" iron supplement contained only 37% of it claimed iron. A second supplement was contaminated with lead. Seventeen other iron supplements met their claims for iron and the purity standard for lead.
Deficiency is commonly seen in menstruating women, children, and pregnant women. Drugs that reduce stomach acid may impair iron absorption. Even mild iron deficiency may cause fatigue and impair learning, memory, and sports performance. Individual needs for supplemental iron range from none to more than two hundred milligrams per day and different forms may be better tolerated than others.
In this Review, you'll get ConsumerLab's test results and comparisons for nineteen supplements and information about four more products similar to ones that passed. You need to subscribe to get the results and ConsumerLab.com's valuable recommendations. In this comprehensive report, you'll discover:
- Which products failed and which passed our tests and why
- How much iron you need
- Forms of iron less likely to upset your stomach
- Foods and medicines that reduce iron absorption -- and ways to increase it
- Potential side effects and cautions

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