T4 hormone

T4, or thyroxine, is a hormone produced by the thyroid gland that helps regulate your body's energy use, metabolism, and overall growth. It contains four iodine atoms and circulates in your bloodstream, where it’s converted into the more active T3 hormone in tissues. T4 influences many bodily functions, including heart rate, body temperature, and how effectively your body burns calories. Maintaining balanced T4 levels is essential for overall health; too little can slow metabolism, leading to symptoms like fatigue and weight gain, while too much can cause rapid heartbeat and anxiety.