Triiodothyronine (T3)

Triiodothyronine (T3) is a vital hormone produced by the thyroid gland in the neck. It plays a crucial role in regulating the body’s metabolism, affecting how the body uses energy, produces heat, and responds to other hormones. T3 also influences growth, development, and heart rate. While T4, another thyroid hormone, is more abundant, T3 is more active in the body. Proper levels of T3 are essential for overall health, and imbalances can lead to issues such as weight changes, fatigue, and problems with heart function. Regular monitoring is important for those with thyroid concerns.