|Synonyms:||levothyroxine; l-t4; t4(hormone); o-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-l-tyrosin; o-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodotyrosine;|
|Character:||White Crystalline Solid.|
|Usage:||One of the thyroid hormones involved in the maintenance of metabolic homeostasis. Synthesized and stored as amino acid residues of thyroglobulin, the major protein component of the thyroid follicular colloid. Synthesis and secretion are regulated by the p.|
How Does Levothyroxine Work?
The thyroid gland makes two similar (although slightly different) thyroid hormones: triiodothyronine (T3) and levothyroxine (T4). Usually, the thyroid gland produces much more T4 than T3 (however, T3 is much more active in the body than T4).
The body can convert the T4 hormone into the T3 hormone as necessary. If your thyroid does not make enough thyroid hormones, there are a few different ways to increase your levels.
Some forms of thyroid replacement combine both T3 and T4 (such as natural thyroid replacement made from pig thyroids). However, because the body converts T4 into T3 as needed, most people can successfully take just T4 (such as levothyroxine). This is the most common type of thyroid replacement. Another option includes taking just T3 hormones.
Although it is synthetic, levothyroxine is identical to the naturally occurring hormone T4.