A 20-Year Research Study Dismisses Reasons Often Given for Not Prescribing T3

Here is a 20-year observational piece of research.

It dismisses the incorrect views that T3 has adverse effects on the bones and heart! 

It confirms that T3 has no adverse effects on heart and bones. This disproves some of the major reasons that doctors use to avoid prescribing T3 - risk to the heart and to bone loss are the two most common reasons used to avoid prescribing T3 to patients, although many of us suspect that cost is the unsaid reason behind non-prescribing of T3.

Note: any mis-dosing of thyroid hormone can cause anxiety and other side effects. There is some reference in the report to psychological side effects of T3 only, but I believe that this due to two possible factors:

1. Most doctors prescribing T3 do not know how to dose it safely and effectively. The 'Recovering with T3' book provides a safe and effective protocol for using T3. This protocol, when folllowed systematically, avoids any tissue over-stimulation. Any thyroid hormone which is mis-dosed can cause tissue over-stimulation. Tissue over-stimulation, can have psychological side effects. Many doctors who do prescribe T3 often attempt to use TSH, FT3 or even FT4 to manage the T3 dosing, and this can result in too much or too little T3 being given. In addition, 3-4 doses of T3 per day are often not used, which is a pity as this is the safest way to spread the T3 out over the day.

2. Patients that are eventually given T3-Only have usually been on T4 then T4/T3 or NDT first. These patients generally have more severe issues than patients who respond to T4 or T4/T3. Some of these patients may have gut issues, toxicity issues from heavy metals or other toxins, sex hormone issues or a number of other problems. Part of the reason they have been given T3, may have been due to other severe issues that have been thought to be thyroid hormone related. Some issues can results in psychological symptoms.

Anyway, it is still a very useful study and it throws out the argument that has been used in the past about T3 causing heart and bone loss issues, which many of us have known were not true anyway when T3 is used properly.

Here is the report:


Best wishes,


(Updated in February 2019)