T4, or thyroxine, is a thyroid hormone produced by the thyroid gland. It plays a crucial role in regulating metabolism, growth, and development in the body. T4 is considered a prohormone because it is less active than its counterpart, T3 (triiodothyronine), but can be converted into T3 where it is needed in the tissues.
Understanding T4 is important for health because it helps maintain energy levels, body temperature, and overall metabolism. If the body does not produce enough T4, it can lead to hypothyroidism, which may cause symptoms like fatigue, weight gain, and depression. Conversely, too much T4 can lead to hyperthyroidism, resulting in weight loss, increased heart rate, and anxiety.
In the body, T4 functions primarily by regulating how cells use energy. It influences various bodily processes, including how fast we burn calories and how effectively our organs function. The conversion of T4 to T3 is a vital process because T3 is the more active hormone that directly affects cellular metabolism.
T4 is mainly produced in the thyroid gland and is released into the bloodstream, where it can travel to different parts of the body. Regular monitoring of T4 levels is essential for diagnosing and managing thyroid-related health issues. This helps ensure that the body's metabolism remains balanced and functions properly.