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Common side effects of iron supplementation include:

  • Constipation or diarrhea
  • Stomach pain and nausea
  • Black stools
  • Metallic taste

Research in The Lancet shows these side effects are dose-dependent and can be minimized by:

  • Taking supplements with food
  • Starting with a lower dose
  • Using a slow-release formula

Severe side effects are rare but can occur with excessive intake. Always follow recommended dosages and consult healthcare providers if side effects persist.

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Last Updated: October 15, 2025

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