Iodine is a trace element, necessary for the synthesis of thyroid hormones. A prolonged deficiency of iodine can cause goitre. The principal food sources are products of the sea and iodized salt. The quantity of iodine found in plants, cereal or water depends on the iodine content of the soil. Milk (between 7 and 12 µg/l) and dairy products are good sources of iodine but the contents are quite variable depending on the region (soil), season and the cows’ feed.
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