(I, I2, latin Iodum)
Iodine is an essential trace element for humans. The average adult has between 20 and 50 milligrams of iodine. Approximately 60% of the iodine is in the thyroid gland, which is located in the base of the neck. The rest of the iodine is in the thyroid hormone, ovary and muscle. The distribution of iodine in the world varies greatly, so that the food that grows in areas with a low concentration of iodine does not contain enough of the micronutrient. These areas are located in Central America, parts of China, Continental Europe, Russia and South America.