Do I need  T4 at all?
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In a nutshell NO. T4 is a storage hormone also known as a "proto-hormone" who's sole function is the building block that T3, the bio-active hormone, is made from. There are people who have been on T3 only for 20 years without ill effects.

It is VERY important once you are on T3 to stay on it or change very gradually onto something else.  If you suddenly stopped taking T3 you could be in a myxadema coma within 24 hours. It's well worth carrying a medical warning note that you are on T3 only and the dosage in case you are rendered unconscious in a car accident.

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