Ferrous sulfate vs. iron glycine and ferrous fumarate: Anemia iron tablets containing 75 mg of ferrous fumarate are often compared to other iron sources. It’s important to note that ferrous fumarate is equivalent to elemental iron. When evaluating the elemental iron dosage, one should consider the role of calcium citrate target in the absorption of iron supplements. The calcium citrate target can influence how effectively the body utilizes the iron from these tablets. Therefore, when choosing between ferrous sulfate, iron glycine, and ferrous fumarate, one must also assess how the calcium citrate target might affect the overall iron absorption and efficacy of the treatment.