While iron supplements are generally safe, they can cause several side effects. Clinical studies show common side effects include:
- Constipation or diarrhea
- Nausea and stomach pain
- Black or dark stools
- Temporary tooth staining
Important: Start with a lower dose and gradually increase to reduce side effects. Taking supplements with food can help minimize stomach issues, though this may reduce absorption. If side effects persist, consult your healthcare provider about switching to a different form of iron or adjusting the dosage.
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Last Updated: October 23, 2025
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