Dextrothyroxine, Levothyroxine, Tyroxine confusion

Daimyo

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Mar 31, 2014
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Most synthetic T4 meds contain Levothyroxine, which is an isomer of Tyroxine. But is Tyoxine the same as Dextrothyroxine?

Is T4 produced by human thyroid gland a mix of Levothyroxine and Dextrothyroxine?

Why manufacturers does not produce "Tyroxine" instead of Levothyroxine?
 

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