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The substance mesterolone (Proviron) is usually considered as an androgenes steroid, partly also erroneously as anabolic steroid, in principle this article could however also be assigned to our series OFF TOPIC. Because mesterolone (Proviron) is basically an androgen which is used in the context of an androgentherapie, but is also very effectiv for diets with regard to a competition. All you should know about this topic is here:


Mesterolone, better known under its brand name Proviron, is the most active substance in bodybuilding with the most wrong types of myths.

In medicine, mesterolone (Proviron) is primarily used in androgen therapy. In particular, the application is aimed at curing libido problems, impotence and general problems associated with androgen deficiencies. However, mesterolone (Proviron) does not stimulate the body's production of testosterone but merely replaces the missing androgens.

Regarding the specific properties, mesterolone (Proviron) is very similar to dihydrotestosterone. Mesterolone (Proviron) does not aromatize, therefore it has no anabolic properties, so it is not possible to build muscle by using mesterolone (Proviron).


In bodybuilding, mesterolone (Proviron) finds a variety of different application areas. For example, many athletes use this active substance in combination with the anabolic steroid nandrolone decanoate to prevent mainly loss of libido and impotence.

Another very popular area of application of mesterolone (Proviron) is the post-cycle therapy area, as the discontinuation of anabolic and androgenic steroids to counteract a sinking androgen level and the associated loss of libido.

Another interesting use of mesterolone (Proviron) is found in the so-called "bridging". This is the targeted bridging between steroid treatments, without losing large amounts of muscle and maintaining the strength level.

Logically, the effect of this androgen has, as is known, also an effect on FAT REDUCTION and on the increase in strength, since the androgenic components of anabolic steroids, in this case of mesterolone (Proviron), increase metabolic rate, have a masculine effect and increase muscular density and hardness.

However, the theory or the use of mesterolone (Proviron) as an aromatase inhibitor is a widespread and risky misconception. Here, mesterolone (Proviron) is said to bind to the so-called aromatase enzyme and to deactivate it so virtually. This is to prevent a conversion from testosterone to estrogen. This thesis, however, is not entirely correct. Mesterolone (Proviron) displaces testosterone from its binding and so this is degraded more intensively. Thus, less testosterone is equivalent to a lower aromatization, which in turn explains why the use of this active substance results in less water absorption and less fat intake.

These factors clearly show that only competition athletes benefit from the use of mesterolone (Proviron). The potent androgenic effect ensures a higher muscle density, hardness and volume. Usually mesterolone (Proviron) is used in the last 2-3 weeks before the competition.


To maintain and increase the libido during steroid treatments and to improve the muscle hardness and density just before a competition, amounts of 25-100 mg per day are used in bodybuilding. From a quantity of 50 mg, the daily dosage is divided into 2 doses.


A clear advantage of mesterolone (Proviron) is that it does not have 17-alpha-alkylation and thus neither gastric nor intestinal load can be expected. Also a liver load can be excluded.

However, mesterolone (Proviron) causes a number of androgen-typical side effects. These include hair loss, aggression, extreme libido, acne, masculinization in women, as well as negative effects on the eyes.

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