Clinical studies suggest that certain forms of iron are better absorbed than others:
- Ferrous sulfate: Most commonly prescribed, good absorption rate
- Ferrous gluconate: Generally well-tolerated, good absorption
- Ferrous bisglycinate: Higher absorption rate, fewer side effects
Liquid iron supplements may be better absorbed than tablets for some people. The most bioavailable form is often ferrous bisglycinate, showing up to 24% better absorption than other forms. However, individual responses vary, and factors like stomach acid levels and other medications can affect absorption. Consider discussing options with your healthcare provider to find the most suitable form for your needs.
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Last Updated: August 18, 2025
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