Iodine can be found in many multivitamin/multimineral supplements, usually in the form of potassium iodine. An extra 150 mcg of iodine each day has not been found to cause toxicity problems, even in addition to iodized salt and dietary iodine. Tolerable upper intake levels (UL) have been set for iodine to prevent high blood levels of thyroid stimulating hormone.
The UL for children ages one to three is 200 mcg; for children ages four to eight, 300 mcg. For children ages nine to thirteen the UL is 600 mcg. For adolescents, the UL is 900 mcg and for adults it is 1100 mcg. The average intake for Japanese people is 2000-3000 mcg daily without causing any apparent problems. Higher levels of iodine are used to treat fibrocystic breast conditions under medical supervision. To summarize, iodine, in its role in thyroid hormones, is vital for metabolism. Iodine is needed to prevent brain damage to fetuses.
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