Thyrox T-3 is an all natural, pharmaceutical grade nutritional supplement from Absolute Nutrition. It is specially formulated to help you reach your fat loss goals when combined with diet and exercise. The active ingredients in THYROX T-3 increase the rate of conversion of T-4, the low activity hormone, to T-3, the high activity hormone. This may cause an increase in basal metabolic rate, or BMR, which are the number of calories one burns at rest. This is accomplished without the use of stimulants.