Iron ferrous fumarate may cause some side effects. It is often combined with vitamin B12 and folic acid in supplements such as hemorferrous gluconate. The typical dosage of ferrous sulfate is 47.5 mg, while ferrous fumarate is administered at 210 mg three times a day. Additionally, it is essential to consider the role of calcium citrate in food, as it can influence the absorption of iron supplements. When taking iron supplements, it is advisable to monitor how calcium citrate in food interacts with the iron intake, ensuring optimal absorption and minimizing potential side effects. Therefore, understanding the relationship between calcium citrate in food and iron absorption is crucial for effective supplementation.