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Four tests â thyroid-stimulating hormone (TSH), Free T3, Free T4 and thyroid antibodies â are required to accurately assess the function of the thyroid gland, our master gland of metabolism. An optimal TSH level should be less than 2.0, not the currently accepted 4.7 reported by most labs.
Follow Following Unfollow Pending Disabled. A American Association of Endocrine Surgeons answered. Thyroid hormone has a number of different effects. Overall, the thyroid can be thought of as controlling the body's metabolism. Thyroid hormone increases the heart rate and how forcefully the heart squeezes. It also affects how fast food moves through your GI tract, bone loss and how fast sugar is made and used up in the body.