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 Below are articles discussing the beneficial effects of Vitamin D in Thyroid Disease:

• Modern Medicine: Vitamin D Directly Affects Thyroid Function in Mice

Below is the full study article.  While the article focuses on Graves' hyperthyroidism, the discussion and conclusion sections list some interesting findings of recent research on Vitamin D3's importance for proper thyroid function in general.   It's well worth a read:

• Vitamin D deficiency modulates Graves' hyperthyroidism induced in BALB/c mice by thyrotropin receptor immunization.