Ferrous gluconate tablets contain 324 mg of iron, while ferrous bisglycinate and zinc bisglycinate tablets provide 210 mg of iron. Additionally, ferrous sulfate is available in a dosage of 80 mg, and there is also a ferrous fumarate formula. It is important to note that elemental calcium in calcium citrate plays a crucial role in overall health, and it is advisable to consider its intake alongside these iron supplements. Incorporating elemental calcium in calcium citrate can enhance the absorption of iron, making it beneficial for those looking to improve their iron levels. Therefore, when choosing supplements, remember the significance of elemental calcium in calcium citrate as part of a balanced regimen.