Importantly, both vitamin D and thyroid hormone bind to similar receptors called steroid hormone receptors. A different gene in the Vitamin D receptor was shown to predispose people to autoimmune thyroid disease including Graves' disease and Hashimoto's thyroiditis.

How much vitamin D should I take for thyroid?

Adults who are vitamin D-deficient should be treated with 50 000 IU of vitamin D2 or vitamin D3 once a week for 8 weeks or its equivalent of 6000 IU of vitamin D2 or vitamin D3 daily to achieve a blood level of 25(OH)D above 30 ng/ml. Supplementation should be continued by a maintenance therapy of 1500–2000 IU daily.

What vitamins affect the thyroid?

Here are specific nutrients that may be beneficial for hypothyroidism.