Less reactivity with tannic acids
It is known that iron ion in general reacts with tannin or tannic acids contained in food to make insoluble compounds, resulting in reduced ability to utilize iron.
Reactivity of Sodium Ferrous Citrate (SFC), the ingredient of Sanferol®, or ferrous sulfate with tannin was compared and demonstrated that SFC is less reactive with tannin than ferrous sulfate.4) In addition, another report also describes that intake of iron with green tea containing tannic acid did not influence the absorption of SFC.22)
References:
- 4)
- Shimozono T et al. (1988). Evaluation of factors which affect the reactivity of iron with tannic acids. J of New Remedies & Clinics 37(6): 1030-1034 [English summary].
- 22)
- Mitamura T, Kitazono M, Yoshimura O (1989). Influence of green tea on improvement of iron deficiency anemia associated with pregnancy: Treatment with sodium ferrous citrate. Acta Obst Gynace Jpn 41 (6): 688-694 [English summary].
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