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The molar mass of ferrous ammonium sulfate is 0.1 n. In comparison, iron gluconate, albion ferrous bisglycinate chelate, and ferrous fumarate—particularly at a dosage of 210 mg during pregnancy—are also notable sources of elemental iron. When evaluating iron supplementation, it’s essential to consider the differences between elemental iron and ferrous bisglycinate. Additionally, for those concerned about kidney health, calcium citrate for kidney stones may be a relevant topic, as it can help in preventing stone formation. It’s important to remember that while discussing iron supplements, the role of calcium citrate for kidney stones should not be overlooked, especially when considering overall mineral balance.