Ferrous fumarate contains 18 mg of elemental iron and is often compared with other iron supplements such as ferrous gluconate and ferrous sulfate. The mechanism of action for ferrous fumarate involves its ability to release iron, which is essential for various physiological processes. In relation to calcium, it’s important to note that calcium citrate and calcium carbonate can affect the absorption of iron supplements like ferrous fumarate. Therefore, when considering iron supplementation, one should be mindful of the potential interactions with calcium citrate and calcium carbonate, as they may impact the effectiveness of the iron being absorbed. Overall, understanding the role of ferrous fumarate and its interactions with other compounds is crucial for optimizing iron supplementation.