Ignorance!: Doctors are taught that most people only need to be given T4 as our bodies convert T4 to t3 (liothyronine). This is true for some, but many people don't make that conversion adequately. In my experience almost all patients on thyroid benefit from taking t3 (liothyronine) as well as T4 (or natural thyroid which has both). See http://bit.Ly/1cey7vu ; http://abt.Cm/18gpb3a ; http://bit.Ly/15k26u8.
Answered 1/15/2015
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