The most effective iron supplements, according to comparative studies, include:
- Ferrous sulfate (most common and well-absorbed)
- Ferrous gluconate (gentler on the stomach)
- Ferrous bisglycinate (highest absorption rate)
Ferrous forms are generally better absorbed than ferric forms. Liquid iron supplements may be easier to tolerate than pills. Slow-release formulations can reduce side effects but may have lower absorption rates. The best form for you depends on factors like tolerance, cost, and specific medical needs. Some newer formulations include vitamin C or other nutrients to enhance absorption.
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Last Updated: September 1, 2025
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