The following article provides the most important facts about iodine. Here you'll learn what iodine actually is, how much iodine your child needs, which foods contain iodine, and when you might need to supplement. Iodine is a trace element and essential for the production of thyroid hormones. We humans obtain iodine through our diet. Typical sources of iodine include fish, seafood, dairy products, bread and baked goods, and iodized table salt. Dairy products have a high iodin