is iodine a trace element in humans
Iodine, a trace element found in soil, is an essential component of the thyroid hormones involved in regulating the body's metabolic processes. Iodized salt and seafood are the major dietary sources of iodine. In the United States, salt is iodized with potassium iodide at 100 parts per million (76 milligram [mg] of iodine per kilogram [kg] of salt).