Common side effects of iron supplements, according to clinical studies, include:
- Constipation or diarrhea
- Dark stools
- Stomach pain or nausea
- Temporary teeth staining
Less common side effects may include heartburn and vomiting. To minimize these effects, start with a lower dose and gradually increase it. Taking iron with food can help reduce stomach issues, though this may decrease absorption. If side effects persist, consult your healthcare provider about switching to a different form of iron, such as iron bisglycinate, which is often better tolerated.
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Last Updated: August 24, 2025
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