Iron plays an important role in helping the body transport oxygen. A lack of iron may weaken the immune system and cause fatigue. Some people are more prone to iron deficiencies than others, including teenage and pregnant women, people with kidney failure, and those with gastrointestinal disorders that interfere with their ability to properly absorb iron. Too much iron can be risky, too, so check with a healthcare professional before taking these supplements. Also see immune support.
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