Iron supplements can cause several side effects, particularly when taken on an empty stomach. Research shows the most common side effects include:
- Gastrointestinal issues: Constipation, nausea, stomach pain
- Stool changes: Dark or black stools
- Tooth staining: Temporary discoloration
To minimize side effects, start with a lower dose and gradually increase it. Taking supplements with food can help reduce stomach upset, though this may decrease absorption. Liquid forms or slow-release formulations might be better tolerated by sensitive individuals.
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Last Updated: October 13, 2025
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