Studies show that different forms of iron supplements have varying absorption rates and side effects:
- Ferrous sulfate: Most common and cost-effective
- Ferrous gluconate: Better absorbed and gentler on the stomach
- Ferrous bisglycinate: Highest absorption rate with fewer side effects
The best form depends on individual tolerance and needs. Slow-release formulations can help reduce gastrointestinal side effects, while liquid forms may be better for those who have difficulty swallowing pills. Always choose supplements that meet USP (United States Pharmacopeia) standards for quality assurance.
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Last Updated: October 17, 2025
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