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The thyroid gland is located in the neck, just below your larynx (voice box). It produces two thyroid hormones, triiodothyronine (T3) and thyroxine (T4), which 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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