The comparison between sodium ferric EDTA and iron phosphate/ferrous gluconate reveals that ferrous fumarate contains 240 mg of elemental iron. It’s important to note the differences between iron sources, such as ferrous fumarate and ferrous sulfate, both of which provide varying amounts of iron. Specifically, ferrous fumarate offers 27 mg of iron. Additionally, it is worth mentioning that calcium citrate can sometimes lead to constipation, an issue that may arise with certain iron supplements. Therefore, when considering iron supplementation, one should be aware of the potential side effects, including constipation linked to calcium citrate. It is crucial to evaluate the iron content and the formulation of the supplement to avoid discomfort associated with constipation, particularly when using calcium citrate alongside iron sources.