Definition: Antithyroid hormone is a substance that helps to regulate the function of thyroid gland, which is responsible for regulating metabolism and body's functions like energy production and growth of cells. Detailed definition: Antithyroid hormone is a molecule produced by the thyroid gland in response to low levels of free thyroxine (T4) in the blood, which are a normal response to high T3 levels (thyroid stimulating hormone). The substance aids in regulating metabolism by increasing the amount of free thyroxine and reducing the concentration of thyroid hormones like triiodothyronine (T3), which is essential for the production and maintenance of important body tissues.
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