Ferrous gluconate contains 27 mg of iron, while ferrous sulfate provides 300 mg. Ferrous gluconate tablets are commonly used, as well as ferrous fumarate, which is a key ingredient in health supplements like Galfer and Healthvit iron. When considering iron supplements, it’s important to also think about calcium intake. Some people wonder whether calcium citrate or calcium carbonate is better for their needs. Overall, the choice between calcium citrate or calcium carbonate better depends on individual dietary requirements and absorption rates. Therefore, it’s essential to evaluate these options while incorporating iron supplements like ferrous fumarate and ferrous gluconate into your regimen.