In these areas,small amounts of iodine to table salt in form of sodium iodide, potassium iodide, and/or potassium iodate is added. This helps preventing iodine deficiency. This product is known as "iodized salt". Iodine compounds have also been added to other foods. This includes flour, water and milk in areas of deficiency. Seafood is also a well known source of iodine. Thus, iodine deficiency is more common in mountainous regions of the world where food is grown in soil poor in iodine.