Vitamin D is a unique nutrient for human health, as the main source of it comes from exposure to sunlight. However, it can also have a regulatory effect on the thyroid gland, which makes vitamin D very important for the treatment of Graves’ Disease. One of the suspected causes of Graves’ Disease, aside from inheriting the condition, is a specific mutation in the receptors of the thyroid gland, and vitamin D has been shown to prevent this mutation from occurring. In addition to exposure to sunlight, vitamin D can be added to your diet through cheese, beef liver and oily fish, such as salmon and tuna.