T4

T4, also known as thyroxine, is a hormone produced by the thyroid gland that plays a key role in regulating your body's metabolism, energy levels, and overall growth. It helps control how quickly your body uses energy and maintains temperature. T4 circulates in your bloodstream, and your body can convert it into T3, the more active form, to support various functions. Proper levels of T4 are essential for normal development, weight management, and energy, while imbalances can lead to health issues like hypothyroidism (low T4) or hyperthyroidism (high T4).