Triiodothyronine T3 is not an anabolic steroid, but it plays a similar role to anabolic steroids to some extent. Although it is a drug used to treat hypothyroidism, but as a hormone (thyroid hormone),  use T3 for bodybuilding, there will be corresponding side effects. Thyroid axis inhibition The first is the inhibition similar to that of anabolic steroids. Exogenous T3 …

T3 increases the body’s metabolic level, and contributing to fat breakdown and muscle growth. Where does the body’s natural triiodothyronine T3 come from? There are two sources of T3 in the body, one directly secrete by the thyroid gland, which accounts for 20% of the total T3 in the body. The other converte from T4, which makes up 80% of …