CAS Number: 1424-00-6
Molecular Formula: C20H32O2
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Mesterolone ( Proviron )
Manufacturer: Hilma Biocare
Pack: 50 tabs/bottle ( 25mg/tab )
Drug class: androgenic steroids
Common names: Proviron, Masterlone, Masterolone, Mesviron 25, Vistimon, Provimed, Provironos, Prov Tablets.
Chemical structure: 1 alpha-methyl-17 beta-hydroxy-5 alpha-androstan-3-one
Info: 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.
- Androgenic index - (30-40)
- Anabolic index - (100-150)
- Estrogen level – None
- Progestational activity – Not significant
- Toxicity for the liver - Low
- Water retention - None
- High Blood Pressure: Rare
The best time to use Mesterolone will be during the cutting period.
During the off-season, this is where most will use the largest amount of testosterone, but most men it will not have a place in an off-season cycle.
Many will use large amounts of testosterone during cutting cycles, especially competitive bodybuilders but lower testosterone plans are more common during the cutting phase.
- Improves testosterone potency
- Reduces circulating estrogen levels by inhibiting the aromatase enzyme which converts testosterone to estrogen (it helps to avoid the estrogen side effects produced by other anabolic steroids)
- Ability to increase muscle density and
- Used in many different hormone cycles to
prevent the development of side effects
- Help the individual breakthrough a sticking point
Dose range and duration of use
Common cycle length is 6-12 weeks
Beginners: Not recommended
Professional Range: 25-150mg/daily
Half Life: 8-12 hours
Detection time: 5-6 weeks
Side effects for women:
Depening of the voice
Changes in skin texture and clitoral enlargement
Depression or aggression
Side effects for men
Raising of libido
Body or facial hair growth
Exacerbation of a male pattern baldness condition
Depression or aggression
To be store in a dry place protected from light, at a temperature of 15-25° C. Keep out of reach of children.
After cycle therapy
Mesterolone is used during in cycles and in post cycle therapy in combination with standard anabolic steroids and testosterone products, as well as with Tamoxifen Citrate or Clomiphene Citrate to achieve a complete suppression of estrogen.
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