For nutritional supplements, i.e. iron and calcium, it is not recommended to take both at the same time; however, for dietary supplements, foods rich in iron and calcium can generally be taken together in moderation. Iron and calcium may compete with each other when absorbed in the small intestine. If taken at the same time, calcium may inhibit the absorption of iron, and iron also affects the absorption of calcium. Therefore, iron supplements should be taken separately from calcium supplements as far as possible, so as not to cause the absorption of iron or calcium to be weakened. In addition, it is best to take iron supplements together with vitamin C to facilitate iron absorption. Foods rich in iron and calcium can generally be consumed together. Some foods may contain both iron and calcium, but the amount of iron and calcium contained therein is not enough to reach the medication dose, so there is generally no problem with normal consumption. It is important to eat a well-balanced diet that contains sufficient iron and calcium. If you need to take nutritional supplements such as iron or calcium, it is recommended that you take them under the guidance of a physician to avoid harming your body.