T3 25mcg 100 Count

Research & Education

T3 (Liothyronine, Cytomel) is the active form of thyroid hormone, approximately 3-5 times more potent than T4 (Levothyroxine) at the thyroid receptor. The thyroid gland primarily produces T4, which is converted to T3 in peripheral tissues by deiodinase enzymes. T3 is the hormone that directly drives metabolic rate, thermogenesis, protein synthesis, and energy expenditure. In the performance and body composition context, exogenous T3 is used to increase basal metabolic rate and accelerate fat loss during cutting phases. It is one of the most effective compounds for increasing daily caloric expenditure and is frequently stacked with anabolic compounds to prevent muscle loss.