As much as about 25 percent of the iodine intake may be
excreted in milk [178]. Therefore, milk content of iodine
also varies depending on the iodine content and availability
in the feeds used. A study on milk and milk products
in Norway , showed that milk from the summer season
had significantly lower iodine concentration (88 ug/l) compared with milk from the winter season (232 ug/l).
This is explained by the use of more supplementary feeds
enriched with iodine during the winter season. Dairy
products supply much of the dietary intake of iodine; in
Norway the most [179], and in US the second most of
the iodine intake.