How does the thyroid function in the body?

The thyroid primarily produces Thyroxine (T4) which is then converted by the liver to the active form of Triiodothyronine (T3). The insufficient production of T4 or the struggle of converting T4 into T3 can be the cause of Hypothyroidism. The conversion of T4 into T3 is impacted by a number of reasons such as nutrient deficiencies, liver disease, medications and stress.