... physiological process in the body, including growth and development, metabolism, body temperature, and heart rate, such as, treatment of ... a fat loss supplement: 3,5-Diiodo-L-thyronine and 3,3'-diiodo-L-thyronine are used as ingredients in certain ... is important for the diagnostic differentiation of euthyroid, hyperthyroid, and hypothyroid states. The major fraction of total triiodothyronine is ...