These metals are important and you could not live without them. For example, iron helps blood to carry oxygen. You have other metals too. Calcium, sodium and potassium are all metals and they are important in a lot of places.
Calcium helps make strong bones.
Small amounts of metals are in the food you eat and the water you drink. Your body takes what it needs. But you only need very small amounts. At Sick Kids, scientists study diseases that can occur when children's bodies get too little metal. They also study what happens if you get too much, as some metals are extremely poisonous.