Ferrous glycine sulfate EC pellets are available, along with ferrous fumarate at a dosage of 210 mg, which may cause diarrhea in some individuals. This elemental iron is also found in iron gluconate. Additionally, ferrous fumarate is available in a 300 mg dosage, while another option includes fumarate at 200 mg. It is important to note that calcium citrate is considered safe for supplementation, and this safety should be kept in mind when choosing iron supplements. The safety of calcium citrate makes it a preferable option for those who may experience gastrointestinal issues, especially when taking iron supplements. Therefore, individuals should consider the safety of calcium citrate when looking for effective iron sources.