Got a two part question for you:
1) If FT3 is the gate to functioning, why do we take any t4 at all? Aside from medical industry politics, is there a physiological or bodily need for t4 medication at all? ( Thought: The healthy unbothered body produces t4, so it can't be useless, no?)
2) For people who do not convert well, are they in jeopardy from taking just t3, in the same way that so many suffer when taking just t4?