Oceans are one of the world's greatest sources of iodine. Iodine can also be found in other salty waters, such as brines found near oil deposits. China, Japan, Russia and Chile are some of the top global producers of iodine.
Iodine's initial discovery came as the result of an examination of seaweed, and because the oceans are abundant with the mineral, seafood and seaweed are two of the of the best dietary sources of this nutrient for human consumption. Seaweed alone can be as much as 45 percent iodine. Table salt is often fortified with iodine, making it an alternative choice for those wishing to add this important nutrient to their diet.