I documented some disturbing findings about T4-replacement: in five studies, it left hypothyroid patients suffering from hypothyroid symptoms.[14][15][16][17][18] And in one study, patients on T4-replacement used more drugs and had an increased incidence of potentially fatal diseases.[18]
Our long line of research shows that some patients with too little thyroid hormone regulation don’t benefit at all from T4-replacement or from T4/T3 combination therapy. Virtually all these patients, however, improve or recover with high enough doses of T3 alone.
On such patients’ behalf, we need to get word of these studies out to their doctors. I hope that doctors who’ve falsely believed that the brain gets T3 solely from T4 will consider the treatment implications of the study results. If so, perhaps they’ll then allow their patients who respond poorly to T4-replacement or T4/T3 therapy to switch to T3 alone, the only approach likely to work for them.