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Hey everyone, this is Susan McCauley from Evolve Nutrition, bringing you this week's fast facts.

Iodine, vitamin D, and selenium can all impact thyroid health through affecting the immune system

and potentially increasing or reducing chances of autoimmunity.

The most common cause of hypothyroidism in westernized countries is an autoimmune process known

as Hashimoto's thyroiditis. Hyperthyroidism is diagnosed when Tsh is high and T4 is low.

Some studies show that you can lower the antibodies associated with Hashimoto's when T-SH is high and T4 is low.

Some studies show that you can lower the antibodies associated with Hashimoto's with selenium.

However, these studies may be biased.

Recommended dosage of selenium is 200 micrograms per day.

There is much association data showing that patients with Hashimoto's or hypothyroidism have low vitamin D levels.

Recently, a study showed treatment with vitamin D decreased TPO antibodies.

Recommended vitamin D levels between 40 to 50 nanograms per milliliter.

Replete vitamin D deficiency with a dose between 2,000 IUs to 10,000 IUs per day.

Best source of vitamin D is good, safe, sun exposure.

A 24-hour urinary iodine test is the gold standard for iodine testing.

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