Research indicates that ferrous sulfate is generally the best-absorbed form, with an absorption rate of 10-15%. However, newer formulations show promise:
- Ferrous bisglycinate (less GI side effects)
- Carbonyl iron (safer in case of overdose)
- Ferrous gluconate (gentler on stomach)
Liquid formulations may be better absorbed than tablets for some people. The choice often depends on individual factors like tolerance and existing conditions. Heme iron supplements, derived from animal sources, typically show superior absorption compared to non-heme forms but are less commonly available.
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Last Updated: October 21, 2025
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