XenoStat from Premier Research Labs a natural supplement that offers advanced thyroid and hormone support. It contains Bladderwrack, a form of kelp that is rich in calcium, iodine, iron, magnesium, potassium, silicon and sodium. It has been used for centuries as medicine, particularly for the stimulation of the thyroid gland. It is said that the iodine in the herb boosts metabolism when it stimulates the thyroid.