Cytomel is the brand and trade name for ‘T3’, which is traditionally termed ‘Liothyronine Sodium’.
Liothyronine Sodium is a synthetic variant of the human body’s own thyroid hormone. It should also be understood that the human body’s own natural endogenously manufactured thyroid hormone is actually known as ‘Triiodothyronine’, which is different from Liothyronine Sodium. Liothyronine is the L-isomer of ‘Triiodothyronine’. Both Liothyronine and Triiodothyronine are nearly identical to one another, however Liothyronine is the more potent variant and is better absorbed orally, (which is why it has been developed into a prescription medicine) and preparation known as Cytomel, Tertroxin, Tiromel, etc. Within the medical and clinical setting, Cytomel (termed T3) is utilized in the treatment of hypothyroidism, which is a condition whereby an individual’s thyroid gland is not secreting normal natural levels of the thyroid hormone for proper performance and function.