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The thyroid gland is located in the neck, just below your larynx (voice box). It produces two hormones, triiodothyronine (T3) and thyroxine (T4). T3 and T4 travel through the bloodstream to all parts of the body where they regulate metabolism—how the body uses and stores energy.

Thyroid function is controlled by the pituitary gland (located in your brain). The pituitary produces thyroid-stimulating hormone (TSH), which stimulates the thyroid to produce T3 and T4.

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The Hormone Foundation

Dr. Lysette Iglesias M.D.

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