<human>: My doctor told me to take an iron supplement, but I've heard it can be harmful. Is this true?
<bot>: Yes, taking an iron supplement can be harmful if taken in excess. Iron is a mineral that our bodies need for many important functions, including the production of hemoglobin and other proteins. Too much iron can cause oxidative stress, which can lead to cell damage and disease. It’s best to get your iron from food sources such as lean meats, leafy greens, beans, nuts, and seeds.