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Role of T3 IN THE BODY

Free T3 levels has been shown to be a strong predictor of death in cardiac patients. A low free T3 LEVEL  

The thyroid hormones (THs), 3,3′,5,5′ tetraiodo-L-thyroxine (T4) and 3,3′,5-triiodo-L-thyronine (T3) play essential roles in both the innate and adaptive immune responses. Despite much research having been carried out on this topic, the available data are sometimes difficult to interpret or even contradictory. Innate immune cells act as the first line of defense, mainly involving granulocytes and natural killer cells. 

Mitochondrial Function

T3 stimulates oxygen consumption and heat production by the mitochondria, and the production of new mitochondria [4, 5].

Therefore, mitochondrial dysfunction can result in symptoms of hypothyroidism, even in the presence of healthy levels of thyroid hormones.

Thyroid Blood Tests & Panels

In the blood, T4 levels are around 45 fold higher (90 nM) than T3 (2 nM).

Most T3 is produced by removing iodine from T4 in a process that requires selenium [40]. 

Ko¨hrle, J. (2000). "The Selenoenzyme Family of Deiodinase Isozymes Controls Local Thyroid Hormone Availability." Reviews in Endocrine and Metabolic Disorders 1(1): 49-58.

  T3 has many unspecified anti cancer effects especially as we age due to the fact that 

due to the fact that