Dietary salt is the consensus means of increasing iodine intakes in populations to combat Iodine Deficiency Disorders. There is little iodine in natural sea salt.
Two studies examine this question:
Fisher and L'Abbe (1980) tested non-iodized sea salt
and iodized table salt and sea salt. The
authors found 52.9 - 84.6 micrograms iodine/gram of salt in iodized salt and 1.2 - 1.4
micrograms iodine/gram in non-iodized sea salt. [see
Fisher, Peter W. F. and Mary L'Abbe. 1980. Iodine in Iodized Table Salt and in Sea Salt.
Can. Inst. Food Sci. Technolo. J. Vol. 13. No. 2:103-104. April]
Aquaron (2000) determined iodine content of natural
sea salt and rock salt, and iodized salt. The
author found iodine levels of less than 0.71 milligrams iodine/kilogram of salt
(micrograms/gram) in non-iodized salt and 7.65 - 100 mg iodine/kg of salt in iodized salt
(depending on the country's iodine laws). [see
Aquaron, R. 2000. Iodine content of non iodized salts and iodized salts obtained from the
retail markets worldwide. 8th World Salt Symposium. Vol. 2:935-940]
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