Methylstenbolone MSten

A strong oral designer supplement sold in gray-market products, chemically built to resist being broken down by the liver — which actually makes it harder on the liver, not easier. There's no controlled human research on it at all.

Also known as M-Sten, Ultradrol, Methyl sten, SE6T9C1YMB, RefChem:404220, orb3181065, CHEBI:79535

Effects Build muscle

Routes Oral

Legal status Unapproved / investigational

WADA Banned at all times

3D Molecular Structure of C₂₁H₃₂O₂

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Chemistry

Formula: C21H32O2
Molar mass: 316.5
CAS: 6176-38-1
PubChem CID: 252380
IUPAC name: (5S,8R,9S,10S,13S,14S,17S)-17-hydroxy-2,10,13,17-tetramethyl-5,6,7,8,9,11,12,14,15,16-decahydro-4H-cyclopenta[a]phenanthren-3-one
InChIKey: TVTSDURKYARCML-IYRCEVNGSA-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 Not established (unapproved designer steroid)

Reported range Historical supplement-era reports: 2.5-10 mg/day

Route Oral

Frequency Once daily

Duration 2-4 week cycles (historical use)

A potent methylated designer steroid sold briefly as a supplement before regulatory action; no legitimate current source, and strongly associated with liver strain even at low doses.

Where this comes from Historical user-reported/supplement-industry literature

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.