Thyroid alternative hormones are medications used to deal with hypothyroidism, a circumstance in which the manufacturing of thyroid hormone within the body is abnormally low. Thyroid hormones boom cellular metabolism (pastime of cells) this is answerable for boom, improvement of tissues, upkeep of mind feature, body temperature law and several other cellular processes. Low ranges of thyroid hormones within the frame can result in many issues given the severa activities that they mediate. The thyroid gland, a gland located within the decrease neck is chargeable for the production of thyroid hormones. It produces two principal hormones, thyroxine (T4) and triiodothyronine (T3). The hormone answerable for most of the biological effects within the frame is T3. When T4 is launched into the blood by using the thyroid gland, maximum of it's miles converted to T3 which is chargeable for the cell metabolic approaches. Commercially to be had thyroid hormones are either natural or artificial (man-made). Desiccated thyroid or thyroid extract (Armor Thyroid, Nature-Throid), a natural thyroid hormone is derived from pork or pork. Levothyroxine sodium (as an instance, Synthroid, Levoxyl and Levothroid), is the synthetic version of thyroxine (T4), liothyronine sodium (Cytomel, Triostat), is the artificial version of tT3 and liotrix (Thyrolar) is a artificial thyroid hormone containing a combination of T4and T3.