What is the most important regulator of metabolism from thyroid gland?

The most important regulator of metabolism from the thyroid gland is thyroxine (T4). Thyroxine is a hormone that is produced and released by the thyroid gland. It is responsible for regulating the rate of metabolism in the body. Thyroxine works by increasing the rate of oxygen consumption and heat production in the cells of the body. This leads to an increase in the rate of metabolism, which in turn leads to an increase in the body's energy levels. Thyroxine also plays a role in regulating the growth and development of the body, as well as the reproductive system.