Iron supplements come in several forms, with varying absorption rates:
- Ferrous sulfate: Most common and economical
- Ferrous gluconate: Often better tolerated
- Ferrous bisglycinate: Higher absorption rate
According to research in Nutrition Research, ferrous bisglycinate shows superior absorption and fewer side effects. However, the best form depends on individual tolerance and needs. Some people find liquid forms easier to digest than tablets. Choose a supplement with third-party testing certification for quality assurance.
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Last Updated: October 15, 2025
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