Different forms of iron vary in bioavailability and absorption. Research indicates that ferrous sulfate is often considered the gold standard due to its high bioavailability and lower cost. However, newer forms like:
- Iron bisglycinate (gentler on stomach)
- Carbonyl iron (fewer side effects)
- Ferrous gluconate (well-absorbed)
A comprehensive review found that liquid formulations and those combined with vitamin C show superior absorption rates. The best choice depends on individual tolerance and specific medical needs.
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Last Updated: October 11, 2025
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