Selenium - a trace element important for the health of the immune system.
 
Selenium is a trace element necessary for optimal thyroid function. It is required for the work of enzymes that produce thyroid hormones, and an enzyme called glutathione peroxidase, a powerful antioxidant that prevents damage to the thyroid follicles. In the absence of selenium, the thyroid gland is unable to produce hormones, and the cells can be damaged by the so-called free radicals.
 
The recommended dose is 400 mcg for three to six months. Maintenance dose is 200 mcg per day.