Research demonstrates that ferrous iron forms are better absorbed than ferric forms. The most common and well-absorbed types include:
- Ferrous sulfate (20% elemental iron)
- Ferrous gluconate (12% elemental iron)
- Ferrous bisglycinate (gentle on stomach)
Ferrous bisglycinate shows superior absorption and fewer gastrointestinal side effects compared to other forms. Liquid iron supplements may be better absorbed than tablets, particularly for those with absorption issues. The addition of vitamin C can enhance absorption by up to 300%. Always check the elemental iron content rather than the compound weight when comparing supplements.
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Last Updated: August 16, 2025
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