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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.
A Major Player in Regulating Your Metabolism. 1  The thyroid regulates your metabolism. 2  The two main thyroid hormones are T3 and T4. 3  Thyroid disorders are common, and they include goiters, hyperthyroidism, and hypothyroidism.