Different forms of iron supplements have varying absorption rates:
- Ferrous sulfate: Most common and well-absorbed
- Ferrous gluconate: Gentler on the stomach
- Ferrous fumarate: Highest elemental iron content
A Blood Advances study shows that ferrous sulfate typically has the best absorption rate among oral supplements. However, newer formulations like iron bisglycinate may offer better absorption with fewer side effects. The best choice depends on individual factors including tolerance and specific deficiency levels.
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Last Updated: September 29, 2025
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