Everyone with Chronic Fatigue Syndrome (CFS) is familiar with the frustration of getting a proper diagnosis and treatment. You also know that at times, you have to take your health into your own hands. That’s why I recommend that anyone with a diagnosis of CFS do one vitally important thing: check your body temperature.

The details on how to do this correctly are on my website, under How are body temperatures measured? If your body temperature is consistently low (below 98.5 F., or 36.94 C. but typically lower than 97.8 F, or 36.56 C) it means that your metabolism is low. That means your body isn’t producing the amount of energy it should.

There’s almost certainly more than one cause of this debilitating disorder, but finding out what’s causing your particular version of it can be an endless trail of expensive diagnostic tests, guessing games and questionable treatments.

Since your metabolism is regulated mostly by thyroid hormones, low body temperature can be due to low thyroid hormone activity in your body. Thyroid hormone activity can be low even if you have normal Thyroid Stimulating Hormone (TSH) levels, and even if you are taking Synthroid which is the most common form of replacement thyroid hormone. (The condition is called Wilson’s Temperature Syndrome.)

There is growing evidence that many of the symptoms that make up CFS, such as debilitating fatigue, brain fog, sore throat, swollen lymph nodes, unexplained muscle pain–can be caused by low thyroid hormone activity in cells in the body. This can be due to impaired thyroid hormone transport which keeps thyroid from getting into the cells. Defects in receptor sites or receptor sites blocked by environmental toxins, can also cause thyroid hormone resistance. Low thyroid hormone activity can also occur if your body is unable to convert T4, the inactive form of thyroid hormone, to T3, the active form. That can happen for lots of reasons, including nutritional deficiencies and toxic overload. It can also happen in people who are receiving only T4 after surgery to remove the thyroid.
T3 can often be helpful in overcoming and even reversing many of these problems. Taking T3 can often help normalize normal metabolism and body temperature. It can literally clear and reboot thyroid hormone pathways so hormone balance and healing can proceed.

Your doctor can call us at 800.420.5801 to get more information about how to use T3, along with nutritional and herbal support for both thyroid and adrenal problems, also often a problem in CFS, and to discuss your individual case. You can also use our website to find the health care practitioner closest to you who is trained in T3 treatment.


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Rosato L, Pacini F, Panier Suffat L, et al. Post-thyroidectomy chronic asthenia: self-deception or disease? Endocrine. 2014 Jul 18.

Tjørve E, Tjørve KM, Olsen JO, et al. On commonness and rarity of thyroid hormone resistance: a discussion based on mechanisms of reduced sensitivity in peripheral tissues. Med Hypotheses. 2007;69(4):913-21.