Iodine importance?

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If you're pregnant, make sure your prenatal vitamins contain 150 micrograms (mcg) of iodine-only 51 percent do. Fetuses and babies need iodine to produce thyroid hormone, which is important for neurodevelopment, and a deficiency can cause mental retardation. That's why the American Thyroid Association recommends that pregnant as well as nursing women take a daily supplement containing 1150mcg of iodine to help them reach th RDA of 220mcg for pregnant women and 290mcg for nursing moms.