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What is the recommended dietary allowance for iodine?

Michael T. Murray, ND
Naturopathic Medicine
The RDA for iodine for adults is quite small, 150 micro grams. Seafood, including clams, and seaweeds, such as kelp, are nature's richest sources of iodine. However, in the U.S., the majority of iodine is derived from the use of iodized salt, which contains 70 micro grams of iodine per gram of salt. Sea salt, in comparison, has little iodine. Due to the high salt intake in the U.S., the average intake of iodine is estimated to be more than 600 micro grams per day.

However, too much iodine can actually inhibit thyroid gland synthesis. For this reason, and because the only function of iodine in the body is thyroid hormone synthesis, it is recommended that dietary levels or supplementation of iodine not exceed 1 mg (1,000 micro grams) per day for any length of time.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.