345 In the index

Methenolone Primo

A steroid (Primobolan) once approved for muscle-wasting conditions and still used medically in some countries, valued for being gentler than most other oral steroids. Clinical use supports modest muscle benefits with less liver strain than similar oral products.

Also known as Primobolan, Metenolone, Metenolonum, Metenolona, 9062ZT8Q5C, RefChem:156983, A14AA04, 205-812-0

Effects Build muscle Lose fat

Routes Injectable Oral

Legal status Controlled substance

WADA Banned at all times

3D Molecular Structure of C₂₀H₃₀O₂

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Chemistry

Formula: C20H30O2
Molar mass: 302.5
CAS: 153-00-4
PubChem CID: 3037705
IUPAC name: (5S,8R,9S,10S,13S,14S,17S)-17-hydroxy-1,10,13-trimethyl-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one
InChIKey: ANJQEDFWRSLVBR-VHUDCFPWSA-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 300-400 mg/week (injectable enanthate) or 50-100 mg/day (oral acetate)

Reported range 200-600 mg/week (injectable); 25-150 mg/day (oral)

Route Intramuscular injection or oral

Frequency Weekly (injectable) or daily (oral)

Duration 8-12 week cycles (unregulated use)

Also known as Primobolan; a Schedule III controlled substance with no current FDA-approved human use in the US, though historically approved elsewhere for muscle-wasting conditions.

Where this comes from User-reported/bodybuilding literature; historical international clinical data

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.

Variants

Name	Abbr	Route	Notes
Methenolone enanthate	Primo E	Injectable	Injectable Primobolan, long ester.
Methenolone acetate	Primo A	Oral	Oral Primobolan, poorly bioavailable.