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In the context of the use of anabolic steroids and growth hormones, the use of thyroid hormones is also becoming increasingly common. Since, in addition to their vital functions, these substances radically influence metabolism and fat burning, the use of these advantages for dietary purposes is becoming more and more frequent. However, as hormones such as T4 should be treated responsibly, the substance levothyroxine is to be elucidated comprehensively. All you should know about this topic is here:


Levothyroxine is, in principle, the synthetically produced variant of the body-borne thyroid hormone T4, which is used by athletes primarily within a diet to achieve a radically low body fat content.

Thyroid hormones, such as levothyroxine (T4), are primarily responsible for the basic calorie metabolism. This is, for example, the reason why people with an overactive thyroid function do not put on weight despite excessive food intake. On the other hand, a rapid increase in weight and fat build-up occur in a subfunction.


Thus, the more thyroid hormones are available, the more rapidly proteins, carbohydrates and fats are utilized.

It is also of particular interest that levothyroxine (T4) is first converted to T3 in the body. In the cleartext, this means that levothyroxine (T4) is first converted enzymatically before an effect can take place.

For the reasons mentioned, it is considered by many to be extremely useless to resort to levothyroxine (T4) at all.

In the field of bodybuilding, levothyroxine (T4) is now rarely used. In the meantime, the 4 times stronger Liothyronine (T3) is used much more frequently. Especially in the field of hobby sport, therefore, T4 is used, since the demands on the hormone are usually not as high as on the professional level and the side effects of levothyroxine (T4) are not as radical as in T3.

Many athletes combine thyroid hormones with, for example, clenbuterol, since a synergetic fat-reducing effect is primarily developed here, and the promising anticatabolic properties of clenbuterol also hope for a muscle protection during the application of levothyroxine (T4).

There are also athletes who use levothyroxine (T4) in the mass phase. Here, the milder thyroid hormone is used, but for a longer period of time to keep the metabolism constantly high, which in turn results in a lower body fat composition during the mass phase. In addition, an accelerated muscle build-up is expected, which is due to the optimized nutrient utilization.

The fear of the use of these thyroid hormones is not uncommon and also justified. Already a big factor that speaks against the use of thyroid hormones is that these hormones properly burn brought nutrients, which can lead to a definite muscle reduction. This is particularly evident in T3. In the case of levothyroxine (T4), catabolic effects are very limited.


First of all, it should be noted that, in addition to a targeted period of administration, it is also important to ensure a slow intake and decay. If you start too early with a high dosage, side effects such as diarrhea, internal restlessness, sleep disorders and excessive sweating are preprogrammed.

Other temporary side effects of levothyroxine (T4) include tremors, flushes, heart rashes, and even mental disorders.


As mentioned briefly, it is advisable to allow the body to slowly get used to an exogenous intake of levothyroxine (T4). Here should usually be started with 25 mcg per day. Subsequently, every 2-3 days can be increased by 25 mcg up to a maximum of 200-400 mcg. Subsequently, the dose is reduced by 25mcg every 2-3 days after the achieved target.

The usual intake period is 6-8 weeks.

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