Mesterolone (Proviron) represents one of the oldest anabolic androgenic steroids on the market. A product of the giant pharmaceutical company Schering, it would first appear in 1934. Officially known as Mesterolone, it has appeared under numerous brand names over the years, but the Proviron name has continually remained dominant.

In many ways, Mesterolone is a very unique anabolic steroid. It shares some strong similarities to (Drostanolone) Masteron and to a degree Oxandrolone (Anavar) and Stanozolol (Winstrol) but in totality it is its own unique animal. In a performance capacity, Proviron is not used to promote large build-up in mass, although it can serve an important purpose during such a phase of training. We will, however, find Mesterolone to be far more common in cutting cycles, but once again its purpose will be somewhat unique.

As a therapeutic agent, Mesterolone is one of the most commonly used anabolic steroids in modern medicine. It will primarily be found in European medicine, especially in Western Europe. The primary purpose of use is treating androgen deficiencies, age being the most common culprit of the condition. It is, however, also used in pre-pubescent males as well. The hormone is also used as a fertility aid in men and this alone makes it a very unique anabolic steroid as most anabolic steroids tend to have the opposite effect.