How much nori, dulse, or arame approximates the recommended daily allowance for iodine? Dairy milk supplies between a quarter and a half of the daily iodine requirement in the United States, though milk itself has “little native iodine.” The iodine content in cow’s milk is mainly determined by factors like “the application of iodine-containing teat disinfectants,” and the “iodine residues in milk originate mainly from the contamination of the teat surface…” Indeed, the teats of dairy cows are typically sprayed or dipped with betadine-type disinfectants, and the iodine just kind of leaches into...

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