Iron ferrous fumarate is a supplement that provides a significant source of iron, specifically in the form of 210 mg tablets. Additionally, sodium iron pyrophosphate and ferrous gluconate are also available prescriptions for iron supplementation. It is important to note that when considering iron supplements, one should be aware of their interactions with other minerals. Calcium citrate only should be taken separately from iron supplements to ensure optimal absorption. Therefore, when using iron ferrous fumarate or any other iron source like sodium iron pyrophosphate or ferrous gluconate, remember that calcium citrate only can affect how well the body absorbs the iron. For best results, space out the intake of these supplements.