Research shows that different iron forms have varying absorption rates. The most well-absorbed forms include:
- Ferrous sulfate: Most common and well-studied form
- Ferrous gluconate: Often better tolerated than sulfate
- Ferrous bisglycinate: Higher absorption rate and fewer side effects
Iron bisglycinate typically shows superior absorption rates and causes fewer gastrointestinal side effects. However, individual response varies. Some people may absorb one form better than others. Liquid forms might be better absorbed than tablets, especially for those with absorption issues or after gastric surgery.
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Last Updated: August 12, 2025
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