Mesterolone ( Proviron )

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Main characteristics All specifications
Dose:: 25 mg/tab
CAS Number:: 1424-00-6
Molecular Formula:: C20H32O2
Package:: 50 tabs
Release form:: Pills


Manufacturer: Hilma Biocare

Package: 50 tablets/bottle (25 mg/tablet)

Info: Proviron is the brand name for mesterolone, an oral anabolic-androgenic steroid (AAS) which is derived from dihydrotestosterone (DHT). For medical purposes, it is especially for androgenic properties while for boosting physical abilities in sports and bodybuilding is rarely done.Mesterolone works by helping to top up the body's natural level of androgens most especially in individuals suffering from low testosterone. It attaches onto various tissues' androgen receptors to stimulate the expression of male secondary sexual characteristics as well as enhance general androgenic action without causing considerable rise in estrogen content. The Mesterolone profile includes an androgenic index of 30-40 and an anabolic index of 100-150. It has no estrogen level, insignificant progestative activity, low liver toxicity, no water retention, and rare high blood pressure.


Mesterolone is recommended for use during the cutting phase of training. While the highest amount of testosterone is typically used during the off-season, most men do not need it in an off-season cycle. Professional bodybuilders may use a lot of testosterone during cutting periods, but a low testosterone regimen is more appropriate. Mesterolone potentiates the effects of testosterone, decreases estrogen levels by blocking the aromatase enzyme, and prevents estrogenic side effects associated with other anabolic steroids.

Dosage Range and Duration of Use

The common cycle duration is 6 to 12 weeks. Dosages are as follows: hobbyists: 25-75 mg/day, professionals: 25-150 mg/day, and women: 25 mg/day. It is not recommended for beginners. The half-life is 8-12 hours, and the detection time is 5-6 weeks.

Side Effects

Side effects for women include deepening of the voice, menstrual irregularities, changes in skin texture, clitoral enlargement, depression, or aggression. For men, side effects include increased libido, oily skin, acne, body or facial hair growth, exacerbation of male pattern baldness, depression, or aggression.

Post-Cycle Therapy

During cycles and in PCT, Mesterolone is taken with regular AS and Testosterone preparations, as well as alongside Tamoximed or Clomid to have full estrogen blockade. 

25 mg/tab
CAS Number:
Molecular Formula:
50 tabs
Release form:

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Tags: Proviron, Masterlone, Masterolone, Mesviron 25, Vistimon, Provimed, Provironos, Prov Tablets