Research indicates that ferrous sulfate is generally the most well-absorbed form of iron, with an absorption rate of about 14-18%. However, other forms may be better tolerated:
- Ferrous gluconate: Gentler on the stomach
- Ferrous bisglycinate: Higher bioavailability
- Carbonyl iron: Lower risk of iron overdose
The best form for you depends on your specific needs and tolerance. Liquid forms may be better absorbed than tablets, while slow-release formulations might cause fewer side effects but have lower absorption rates.
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Last Updated: October 3, 2025
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