Should I buy triiodothyronine T3 or thyroxine T4 for bodybuilding?

In the previous article, we learned about the role of thyroid hormones T3 and T4, and found that T3 is mainly playing a benefit, and did not see the advantages of T4. Then I can buy T3 directly, why buy T4?

First, we need to understand the relationship between T3 and T4.

The thyroid gland is a butterfly-shaped endocrine gland located in the anterior and lower part of the neck, from which both T3 (triiodothyronine) and T4 (thyroxine) are produced.

In the blood circulation, T4 is the main form of thyroid hormone, accounting for about 95%, and T3 accounts for a smaller amount, about 5%. However, T3 is the main active form of thyroid hormone, and its effect on the target tissue is about 4 times that of T4, so the effect of T3 is stronger. In principle, when bodybuilder uses thyroid hormones, choose to use T3 for better results.

What is the role of T4?

When the thyroid gland produces thyroid hormone, most of it is T4. And when T4 comes to the liver and other parts through the blood circulation, remove the iodine atom on the fifth carbon atom of the outer ring to form T3. Therefore, the T3 that exists naturally in the body is actually mainly derive from T4. T4 is the precursor of T3, and it can basically be said that there is no T3 without T4.

When bodybuilder use T4 is, its effect is milder, with less stimulation of metabolism and muscles, and fewer side effects. Most of T4 eventually converte into T3, which will also play the role of T3.

However, there is also a case where you can only use T3, not T4.

T4 can deiodize into T3, if the conversion change, T4 can not converte into T3. Then add more T4, may not have any effect. This condition is rare because T3 is the main active form of thyroid hormone, and if the conversion from T4 to T3 is impairing, your body must be dealing with a low thyroid hormone state and you will be able to detect it easily. So, for bodybuilder, T4 is the safest way to go.

Some Bodybuilders are reluctant to give up the rapid action of T3 because it acts quickly on skeletal muscle, significantly increasing skeletal muscle strength, contractility, and endurance, enhancing protein synthesis, and promoting muscle growth. At this time, buy T3 and T4 together.

bodybuilder uses T4 first, and then adds a small dose of T3 according to the effect and tolerance amount. If the combination of the two is appropriate, it can produce the desired effect and effectively control the side effects.