Common side effects of iron supplements include:
- Constipation (most common)
- Nausea and stomach pain
- Black or dark stools
- Temporary tooth staining
Recent studies show that slow-release formulations can reduce gastrointestinal side effects by up to 40%. According to research, taking iron supplements with food can decrease side effects but may reduce absorption by 40-50%. 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 21, 2025
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