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Mesterolone Prov

An oral steroid (Proviron) approved in some countries, though not the U.S., for men with low testosterone, notable for not converting to estrogen. Its approved use is supported by clinical experience, and it's also used off-label alongside testosterone therapy to help with libido and estrogen control.

Also known as Proviron, Androviron, Testiwop, SH 723, Mesterolona, Mesterolonum, Pro-Viron

Effects Hormonal Libido

Routes Oral

Legal status Prescription drug

WADA Banned at all times

3D Molecular Structure of C₂₀H₃₂O₂

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Chemistry

Formula: C20H32O2
Molar mass: 304.5
CAS: 1424-00-6
PubChem CID: 15020
IUPAC name: (1S,5S,8R,9S,10S,13S,14S,17S)-17-hydroxy-1,10,13-trimethyl-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-one
InChIKey: UXYRZJKIQKRJCF-TZPFWLJSSA-N

Reported dosing

User-reported

What has been reported in the literature and by users. This is a record of what is done, not a recommendation.

Typical dose 50-75 mg/day

Reported range 25-100 mg/day

Route Oral

Frequency 1-3 times daily

Duration Chronic (as prescribed, where approved) or cycle-length (off-label bodybuilding use)

Approved in some countries (as Proviron) for male hypogonadism; not FDA-approved in the US. Widely used off-label by steroid users as a weak androgen with minimal suppression of natural hormone production.

Where this comes from International prescribing information; off-label user-reported dosing

There is no approved human dosing for this compound. The figures above are what users and vendors report, not what has been established as safe or effective. Treat them as a record of what is done, not as guidance.