Do You Eat Magnetic Cereal? Look at the box your cereal comes in. If it says it has 100% of your daily recommended supply of iron, then this experiment will work for you, too. But you will also need a very powerful magnet. In this video I used as series of small neodymium magnets which are usually available in science supply catalogs. Our body uses iron to carry out cell production and made our blood. Iron is a mineral, and the iron found in your cereal used to be in the ground. Yum!