Clinical studies suggest that ferrous sulfate is generally the best-absorbed form of iron, though newer formulations like iron bisglycinate show promising results with fewer side effects.
Common iron forms ranked by absorption:
- Ferrous sulfate (most traditional and well-studied)
- Iron bisglycinate (gentle on stomach)
- Ferrous gluconate (well-tolerated)
- Ferric iron forms (least well-absorbed)
The choice of supplement should consider individual factors like tolerance, cost, and specific medical conditions. Some people may absorb certain forms better than others, so working with a healthcare provider to find the optimal form is recommended.
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Last Updated: October 9, 2025
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