There are about 65 mg of elemental iron in a 325 mg ferrous sulfate tablet. Ferrous gluconate is 12% elemental iron, while ferrous fumarate is 33% elemental iron.
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Best Time to Take Iron Supplements for Maximum Absorption, According to ExpertsMost iron supplements are made from ferric or ferrous iron salts. Common types include ferrous sulfate, ferrous gluconate, ...
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