Iodine is a trace mineral and a nutrient found naturally in the body. Many months of iodine deficiency in a person's diet may cause goiter or hypothyroidism. Iodine is needed for the cells to convert food into energy. Humans need iodine for normal thyroid function, and for the production of thyroid hormones. Without enough iodine, the thyroid cells and the thyroid gland become enlarged. Very high intake of iodine can also reduce the function of the thyroid gland. The AI for Iodine is 110 mcg for 0-6 months infants, 130 mcg for 7-12 months infants, 90 mcg for 1-8 years children, 120 mcg for 9-13 years children, 150 mcg for 14 and above. Pregnant women should have 220 mcg and lactating women 290 mcg.