$58.00 $41.40

Product name: Proviron

Manufacturer: Bayer Pharma

Active substance: Mesterolone

Other names: Provironos, Mestoranum, Provironum, Proviroxyl, Vistimon, Proviron, Mesviron 25, mesterolon, mesterelon, mesterelone, mesterolone, mesviron, mesvirone, mesvirone25, provirone, Androviron, Dapoder, Gavrol-in, Mesteranum, Sten-or., Testiwop

Strength: 25 mg

Quantity: 50 tablets







Proviron by Bayer Schering is a steroid drug widely used in both traditional and sports medicine. It is used primarily by athletes as part of heavy steroids cycles to prevent side effects, because it has anti-estrogenic properties (as an aromatase inhibitor) and the ability to increase free testosterone (by reducing the function of sex hormone binding globulin).

At the base of the product, the active ingredient, Mesterolone, is a structural derivative of dihydrotestosterone, which determines its properties.

Bayer Proviron is primarily a moderately strong androgen (up to 150% of endogenous testosterone), and its anabolic effect is characterized as minimal (up to 40% of endogenous testosterone). This is a high-speed drug (up to 12-24 hours), therefore, to achieve optimal results, it is required to take it with a daily periodicity.

Proviron is actually a drug with anti-estrogenic activity. By blocking the estrogen receptors in the brain, it causes a surge in the release of the Gonadotropins (LH and FHS) which then induce the testes to make more testosterone.

The drug does not possess any direct anabolic or androgenic activity.

There is no mass manufacture of this drug. While Proviron is available on cyberspace for sell, there are reports that the drug is smuggled in from in from Asia, Russia and Mexico.

It way initially tried out to treat both men and women who had depression and anxiety.

What was discovered in these studies was that the drug led to an increase in the Gonadotropins (LH & FSH) and increased testosterone levels. This then led to its use in the treatment of fertility problems. Today Proviron is no longer available and not used to treat any medical disorder.


Once upon a time, Proviron was indicated for treatment of testosterone deficiency, and male infertility problems due to a problem in hypothalamus, pituitary or testes

Proviron has more androgenic activity rather than anabolic effects. It is used by athletes and bodybuilders to help the body recover from the testosterone suppression that occurs after prolonged use of exogenous anabolic steroids.

The majority of bodybuilders who have used Proviron have been disappointed. The drug has failed to live up to the hype. Most users have claimed that the drug does not increase muscle mass or strength. In fact, the majority of individuals consider it a waste and unwarranted.

The drug does possess anti-estrogen activity like Nolvadex or Arimidex. Thus, it blocks the breast enlargement and water retention which are common side effects of most anabolic steroids.

Some users do claim that it causes the muscle to bulge and a rip- however, many of these users take so many other anabolic steroids; it is difficult to know which drug is actually responsible for the muscle growth. The drug has predominantly been used during the washout cycle to maintain the testosterone surge. Most knowledgeable athletes have stopped using Proviron and have turned instead to Arimidex or Nolvadex.


Proviron has also been used by females in the past. While there have been reports of its bodybuilding properties, there are just as many females who claim that the drug has done very little. Because of its anti-estrogen activity, all females who take this drug must be followed up by a health care professional.

Bodybuilding Benefits

Proviron from Bayer with the proper construction and conduct of the course for sports purposes develops the following effects:

Increased levels of free testosterone, as a consequence, increased libido, erectile function and spermatogenesis;

Blocking of aromatization – prevents the development of estrogen-dependent side effects, like gynecomastia in men;

Qualitative growth of muscles without excess water and fat, accompanied by increased density and relief of muscles.


Dose of Mesterolone is 25 mg by mouth 2-3 times a day for several months, followed by maintenance therapy for a few months. Proviron when taken orally is rapidly absorbed in the blood stream. It has a very long half life of close to 12-24 hours. It remains in the body for a long time and is easily detected in the urine for at least 2 weeks after the last dose.

Because the drug is not an effective anti-estrogen it is often combined with Tamoxifen or Arimidex. It is usually taken during the wash out phase.


Like any drug, Proviron also is associated with some rare side effects. While the side effects do not occur in all individuals, they are quite disturbing. The side effects include:

painful erections

loss of libido

general fatigue

deepening of voice

hair growth

acne, oily skin


Proviron is not recommended for use in:


in pregnant females

individuals with abnormal liver function

individuals who have prostate cancer

those who have allergies


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