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Vince Carter-- Per Dr Saya...Ferrous Sulfate is approx 32% elemental iron. Ferrous Gluconate is approx 12% elemental iron. Ferrous Fumarate is 33% elemental iron. Differences are highly individualized person to person with different GI tolerance and varying absorption.  For an iron deficient patient, ANY iron is better than no iron and follow-up labs can determine effective absorption or the need to increase or change supplements." If you are concerned or just curious we can order a Full Iron Panel for you...call me tomorrow if you would like me to order that for you.