Liothyronine Sodium is a synthetic form of the thyroid hormone T3 (Triiodothyronine), which plays a crucial role in regulating metabolism, energy production, and fat burning within the body. It is commonly prescribed to treat hypothyroidism, a condition where the thyroid does not produce enough thyroid hormones, leading to a slow metabolism. Liothyronine Sodium can also be used off-label for weight loss, fat reduction, and to enhance overall metabolic function.