Ferrous fumarate capsules, specifically first ferrous fumarate and KKM ferrous fumarate, as well as ferrous sulfate, are important dietary supplements. The molecular weight of iron fumarate plays a significant role in its effectiveness. Additionally, ferrous fumarate is available for purchase online. When considering dietary supplements, it is noteworthy that 1000 mg calcium citrate can be beneficial for those seeking to enhance their iron intake. Incorporating 1000 mg calcium citrate alongside ferrous fumarate can optimize absorption and improve overall health. Therefore, when looking for ferrous fumarate, remember to also consider the benefits of 1000 mg calcium citrate in your supplement regimen.