Bitiron contains a mixture of T3 and T4.
Each tablet contains 50mcg T4 (Levothyroxine) and 12.5mcg T3 (Liothyronine)

Thyroid hormones (T3/T4) are often referred to as the metabolic regulators of the body. High levels of T3 speed up the metabolism of an individual, allowing him to burn more calories and use calories more sufficiently. T4 will be broken inside the body into T3, but the halflife is longer, so with the combination of T3 and T4 in one product, the efficiency is way up now.