Different forms of iron supplements vary in bioavailability and absorption. Research shows that:
- Ferrous sulfate: Most common and generally well-absorbed
- Ferrous gluconate: Often better tolerated with fewer side effects
- Ferrous bisglycinate: Higher absorption rate and gentler on the stomach
Liquid forms typically have better absorption rates than tablets. Some newer formulations include time-release options that may reduce gastrointestinal side effects. Always choose iron supplements that have been third-party tested for quality and purity.
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Last Updated: September 11, 2025
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