Check the labels. If you get enough iron in your diet you don't need a supplement. Taking unnecessary supplements may be harmful. You can accumulate too much iron in your body, which can damage various organs. If you have iron deficiency anemia, your health care provider may recommend a supplement.
Some supplements cause constipation.
Make sure you drink enough fluid and have enough fiber in your diet. Written by Pierre Rouzier, M.D., for Clinical Reference Systems.