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Proviron (DHT, Masterlone, Masterolone, Mesterolone)

Proviron (Masterolone) est une forme orale de 1-méthylé DHT (methyl-dihydrotestostérone). This is very strong androgen which is 3-4 times more effective than “normal” testosterone, it possesses no anabolic characteristics and no capabilities of converting to estrogen. One would imagine then that mesterolone would be a perfect drug to enhance strength and achieve some progress. Unfortunately, there is a control mechanism for DHT in the body. When levels get too high it is being converted to an inactive compound. This inactive compound can equally be transformed in the opposite direction to dihydrotestosterone by the same enzyme when low levels of DHT are detected. But this means that very large amounts of this substance are useless to achieve muscle hypertrophy. Very common usage is fighting estrogen just like with Tamoxifen Citrate or Clomiphen. Provironhas four distinct applications in bodybuilding.First of all, proviron serves as anti-estrogen, it prevents  aromatization of other steroids as a process and also partially blocks estrogen receptors. In this instance its action differs from tamoxifen, which only blocks  estrogen receptors. Thus side effects such as gynecomastia and increased water retention are successfully eliminated. Proviron hits the root of the problem, while Tamoxifen fights only symptoms and should be used for longer period until all excessive estrogens are washed out of the body.
The second application is based on expanding the capacity of testosterone. 97-98% of testosterone in the body of a healthy person is inactive and bound to certain proteins. Proviron in this case replaces testosterone, thus more of latter is being released into the blood and helps to build muscle mass.

Thirdly, mesterolone is added in pre-competition cycles to increase the rigidity and quality muscle volume. It also decreases water retention in the body, giving the user a visual effect of a dry, high-quality, lean muscles. Proviron is often used not only among bodybuilders, but even the actors and models, who use it to acquire the necessary sportive form  before the shooting. Just like the another methylated DHT structure called drostanolone, mesterolone is particularly strong in achieving this effect.Finally, Proviron is used for recovery of sexual activity during the cycles of steroids such as trenbolone and nandrolone, which decrease libido. Proviron is also commonly prescribed by doctors for people with low levels of testosterone, or patients with chronic impotence.Mesterolone is preferred by many athletes because it has virtually no side effects on men. In large doses it can cause some virilization symptoms in women. Doses of 25 and 250 mg per day shall be applied without adverse effects. 50 mg per day is usually sufficient to reach goals for any of four applications that we mentioned above. Thus, there is no need to increase the dose.

Les athlètes masculins devraient préférer Proviron à Nolvadex. Avec Proviron, l'athlète atteint une meilleure dureté musculaire, car le niveau d'androgènes est augmenté et la concentration d'œstrogène reste faible. Cela est particulièrement évident lors de la préparation d'une compétition en conjonction avec un régime.

Cependant, il faut être conscient que la perte de force causée par la diminution de la production naturelle de testostérone après le cycle n'est pas guérie. L'athlète doit utiliser d'autres médicaments comme HCG et clomiphen pour cela.

Dosage et utilisation

Proviron est un composé très efficace, la posologie quotidienne de 50 mg est suffisante bien que certains hommes en fassent 100 et même 250 mg / jour. L'athlète prend normalement un comprimé de 25 mg le matin et l'autre le soir. Dans certains cas, même un comprimé de 25 mg suffit. L'association de 50 mg de Proviron par jour et de 20 mg de Nolvadex par jour entraîne une suppression presque complète des œstrogènes. Cependant, gardez à l'esprit que l'œstrogène n'est pas un mal absolu, il joue également un rôle important dans la construction musculaire. La suppression complète des œstrogènes signifie des gains plus faibles, il faut donc garder un équilibre et diminuer le niveau d'œstrogènes uniquement au point où il n'y a pas d'effets secondaires mais en produit toujours des positifs.

In the past athletes used it throughout the whole season to make dry and fit outlook all the time, however, we don’t advice such practices nowadays. Clenbuterol / albuterol (ventolin) can do the same but with less side effects.


Proviron is an oral 1-alpha-alkylated substance mostly used as  an anti-estrogen drug. Mesterolone may actually contribute to gains.  It is taken daily in 50-100 mg doses.

The best stack is certainly with testosterone. This results in qualitive, lean gains as free testosterone levels are increased and less converted to estrogen.

Bien sûr, le proviron est également utilisé dans de nombreuses autres piles, par exemple avec le dianabol (méthandrosténolone), l'undécanoate de boldénone et la nandrolone afin de réduire les activités liées aux œstrogènes et d'augmenter la dureté musculaire.

Combo of proviron with boldenone makes dead lock for a cutting stack. Sometimes it’s even become possible to add deca into that cutting stack, preferably along with winstrol. It’s good idea to use proviron with nandrolone, because nandrolone temporarily decreases libido.

Temps de détection

2 mois

Effets secondaires avec proviron

When athlete do it for more than 10-12 weeks it may slightly increase liver values although in general proviron is well tolerated by it. Side effects of Proviron for men with a dose of 2 – 3 tablets are very small, so that Proviron, in combination with a steroid cycle can be relatively safe to be taken over several weeks.

DHT can increase blood pressure. High dosages may lead to premature baldness and sexual overstimulation, which leads to prolonged erection. Since this state is painful and can cause penis damage, it makes sense to reduce the dose or discontinue its use altogether.

Only 34% of recipients observe minor decrease in endocrine glands function. Proviron did not stop work of HPTA (glands) for noone who took the drug for a year at a dose of 150 mg / day. In general it’s pretty safe and has little impact on the work of HPTA.

Il n'y a pas d'effet sur le taux de LH (hormone lutéinisante) et de FSH (hormone stimulante) à une posologie de 100 à 150 mg / jour.

Proviron ne remplace pas Clomid comme traitement hormonal, mais ne cause pas non plus de problèmes.

L'impact de la mestérolone ne produit aucun changement dans les niveaux de stéroïdes, d'hormones thyroïdiennes, de gonadotrophines et de prolactine.

Usage féminin

Les athlètes féminines doivent être prudentes lors de l'utilisation de Proviron, car il n'exclut pas tous les effets secondaires androgènes possibles. Il est conseillé aux femmes de ne pas prendre plus d'un comprimé de 25 mg / jour. Des doses plus élevées et une utilisation prolongée pendant plus de 4 semaines augmentent les risques de virilisation. Les athlètes féminines qui n'ont pas de problème avec Proviron obtiennent de bons résultats en prenant 25 mg de Proviron par jour et 20 mg de Nolvadex par jour. Ils disent qu'en combinaison avec un régime, il accélère la combustion des graisses et le durcissement rapide des muscles.

Female athletes who naturally have higher estrogen levels,  often add Proviron to steroid cycle, which results in increasing of muscle density. In the past female athletes did proviron whole year in order to look lean, especially before contests and starring. Nowadays, clenbuterol / albuterol do the same work, because they do not cause virilization effects.

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