Iodine helps to make the thyroid hormones. These hormones help to keep cells and the metabolic rate healthy.
Good sources of iodine Iodine is a trace element found in seawater, rocks and some types of soil. Good food sources include sea fish and shellfish. Iodine can also be found in plant foods, such as cereals and grains, but the levels vary, depending on the amount of iodine in the soil where the plants are grown.