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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.
Levothyroxine replaces T4 hormone, one of two important hormones -- T3 and T4 -- that control metabolism. Your body can synthesize T3 hormones from levothyroxine even if you are hypothyroid, so there is rarely a need to supplement both T3 and T4 hormones.onclusion. Any vitamin supplement that you and your doctor agree should be added to your diet can be taken with levothyroxine, provided that you don't take your vitamin or supplement within four hours of taking your thyroid replacement hormone.