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Common side effects of iron supplements include:

  • Constipation or diarrhea
  • Nausea and stomach pain
  • Dark stools
  • Metallic taste

Research shows that slow-release formulations or taking supplements with food can help minimize gastrointestinal side effects. Serious side effects are rare but can include iron overload, especially in people with hereditary hemochromatosis. Always store iron supplements out of reach of children, as iron overdose can be dangerous.

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Last Updated: October 25, 2025

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