Primobolan (methenolone)
Muscle & Strength · Injectable/oral anabolic
Tier C+
Bottom line
Read Off Label grades Primobolan (methenolone) as C+ (5.5/10) based on moderate evidence, med benefit magnitude, and a med-risk safety profile.
Famously favored by Arnold Schwarzenegger.
Studied, labeled, or reported-use context: Injectable: 200-600 mg/week; oral: 50-100 mg/day — Schedule III US; Rx history discontinued; banned sport; not individualized guidance.
Citation correction in progress
1 PubMed link was found to be unrelated to this entry and removed from public output. The remaining sources are shown below, but this row's claims and score still need a full source-by-source revalidation.
What the evidence says
Famously favored by Arnold Schwarzenegger. Mild profile makes it popular for women and for 'clean' cutting cycles, but correspondingly slow gains. Extensively counterfeited due to expense of genuine product.
Mechanism
DHT derivative; mildly anabolic, non-aromatizing; oral acetate form (methenolone acetate) or injectable enanthate; historically used in premature infants and osteoporosis
Studied, labeled, or reported dose & route
Injectable: 200-600 mg/week; oral: 50-100 mg/day
This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.
Citations
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Common questions
- What does the evidence show about Primobolan (methenolone)'s effects?
- Read Off Label rates the evidence for Primobolan (methenolone) as Moderate and the benefit magnitude as med, producing an overall grade of C+ (5.5/10). Famously favored by Arnold Schwarzenegger.
- What safety findings are reported for Primobolan (methenolone)?
- Primobolan (methenolone) has a med risk profile in the database. Med (mildest AAS profile comparable to Anavar; oral form not C17-aa so less hepatotoxic but also less bioavailable; HPG suppression) Legal status: Schedule III US; Rx history discontinued; banned sport.
- What doses or routes are reported for Primobolan (methenolone)?
- Injectable: 200-600 mg/week; oral: 50-100 mg/day This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
- How does Primobolan (methenolone) work?
- DHT derivative; mildly anabolic, non-aromatizing; oral acetate form (methenolone acetate) or injectable enanthate; historically used in premature infants and osteoporosis
This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.