Research indicates that ferrous sulfate is generally the most readily absorbed form of iron supplement, with an absorption rate of about 30%. However, newer formulations show promise:
- Ferrous bisglycinate: Often better tolerated with fewer side effects
- Carbonyl iron: Slower release, potentially safer
- Liquid iron: May be easier to absorb for some people
The best form for you depends on factors like your tolerance level and specific needs. Heme iron supplements, derived from animal sources, typically show higher bioavailability than non-heme forms but are more expensive. Discuss options with your healthcare provider to find the most suitable form.
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Last Updated: September 5, 2025
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