Research suggests that ferrous iron supplements are better absorbed than ferric iron. The most common forms include:
- Ferrous sulfate (most widely used)
- Ferrous gluconate (gentler on stomach)
- Ferrous fumarate (highest elemental iron)
Absorption rates vary: Ferrous sulfate typically has 20% absorption rate when taken on empty stomach with vitamin C. New formulations like iron bisglycinate may offer better absorption with fewer side effects. Liquid forms may be better for those who have difficulty swallowing pills or need faster absorption.
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Last Updated: October 19, 2025
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