Bitiron is a synthetically derived thyroid hormone replacement preparation. It consists of levothyroxine sodium (thyroxine, T4) and liothyronine sodium (triiodothyronine, T3) in a 4 to 1 ratio by weight. Liotrix was developed when it was believed that serum levels of both T4 and T3 were maintained by direct thyroidal secretion. It is now known that the thyroid gland secretes approximately ten times more T4 than T3 and that 80% of serum T3 is derived from deiodination of T4 in peripheral tissues. Administration of levothyroxine alone is sufficient for maintaining serum T4 and T3 levels in most patients and combination hormone replacement therapy generally offers no therapeutic advantage. In fact, administration of T3 may result in supratherapeutic levels of T3.
Liothyronine Sodium T3 is a synthetic hormone that has been used to increase the activity of the thyroid gland. It is used on the side as a supplement, with more popularity resting on its T-3 promotion alongside anabolic steroid use. Bodybuilders have been using it to increase the metabolism in their cells. With the use of T3 Cytomel, the parts of the cells referred to as mitochondria will burn more nutrients and cause the cells to perform more efficiently. Fat will be burned from the body with T3 Cytomel thanks to the effect that it has.