T3

T3, or triiodothyronine, is a hormone produced by your thyroid gland that plays a critical role in regulating your body's metabolism. It influences how your body uses energy, maintains body temperature, and supports growth and development. T3 is more active than the other thyroid hormone, T4, and helps coordinate many bodily functions. The level of T3 in your blood can be measured to assess thyroid health, especially if you're experiencing symptoms of an overactive or underactive thyroid. Proper T3 levels are essential for maintaining overall energy and metabolic balance.