Why would T3 only be better to use for some people than desiccated thyroid?

[Elbeth]

T3 is the biologically active thyroid hormone - T4 DOES NOTHING ON ITS OWN - EVEN IN NATURAL THYROID T4 IS USELESS UNTIL IT IS TRANSFORMED INTO T3.

Some people are tired of being ill and just want to get well as fast as possible. For them T3 replacement can be the most direct and effective way of doing this. In some cases people will never get well even with NDT.

I'm a little confused

First, I cannot understand how T4 came to be the "normal" medicine in treating Hypothyroidism, when it makes so many problems for so many patients.

When I started on a combination of T4 (75 mcg) + T3 (10 mg) daily, I immediately got better, and within a month we raised T3 to 20 mg. Sadly the good feeling and new energy only lasted for about a year.

I think I am one who can't convert T4 to T3, since T4 only treatment only made me worse. I'm now on 3 ½ grains Thyroid (217.5 mg daily). So why did the combination of syntetic medicines make me worse while NDT dosn't ?