Engaging book with sound scientific theory. As a patient with hypothyroidism who didn't respond to the normal T4, it has been a great help. It has also has broadened my understanding of my co-morbid endocrine issues and how they correlate to the thyroid. Currently reading the other book re CT3M. A knowledgeable and concise thyroid book that is focused on the use of Liothyronine/ T3 and from both books, I have gained more knowledge as well regarding cortisol function.