People taking iron supplements tend to have dark or black stools. Some regard this as a sign that the iron is being absorbed in the body. If the stool does not darken, it may mean that the iron supplement is not working and the brand of pills may have to be changed or the situation may have to be discussed with a pharmacist or doctor.
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A side effect of taking iron pills is that they may turn your bowel movements black or very dark green in color. This is perfectly normal.