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Thyroxine (T4)

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Thyroxine (T4) is the dominant thyroid hormone secreted by the thyroid gland into the bloodstream. That is the inactive form, and organs such as the liver and kidneys transform it to the active form, triiodothyronine. Thyroid hormones are essential for the body’s metabolic rate, heart and digestive functions, muscle contraction, brain development, and bone maintenance.

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