When dietary intake is not enough, many people take iron supplements, which are available in many forms and different formulations. In some cases, supplements are essential; however, side effects can be a cause for concern.

1. Digestive Upset

Oral iron supplements can cause some mild digestive problems, including:

Upset stomach

Constipation

Nausea

Abdominal pain

Vomiting

Diarrhea

You may need to take iron with food to prevent these problems. The side effects can be caused by taking iron supplements on an empty stomach.

2. Dark Stools

Dark or black stools can be a typical side effect of oral iron tablets. However, you should tell your healthcare provider if you have:

Stools with red streaks (blood streaks)

Stomach cramps

Sharp stomach pain

Soreness in the stomach

3. Metal

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