Primobolan (Oral)
Methenolone Acetate · Primo Oral
Oral methenolone acetate; mild, low-side, short half-life. Simple model — peak calibrated.
Key takeaways
- Oral DHT derivative (methenolone acetate); mild, non-aromatizing, 1-methyl rather than 17-aa.
- ~5-hour half-life; daily dosing, often split.
- Plotter bioavailability (88%) is extrapolated from injectable data — real oral availability is poor.
- Gentle on the liver for an oral; still suppressive and frequently counterfeited.
Reported dosing protocols
Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.
| Use case | Dose | Route | Frequency | Duration |
|---|---|---|---|---|
| Wasting / underweight (historical label) | 50–100 mg daily | Oral | Daily (split) | Weeks–months |
| Cutting (community) | 50–100 mg daily | Oral | Split 2× daily | 6–8 weeks |
Pharmacokinetic summary
- Model tier
- Simple (t½ + F, Tmax estimated)
- Half-life
- 5.0 hours
- Cmax
- 56.7 ng/dL
- Bioavailability
- 88%
- Typical dose
- 25–100 mg
Harm reduction
- Aromatizes
- No
- DHT derivative
- Yes
- Hepatotoxicity
- mild
- Injection frequency
- Oral, daily
Frequently asked questions
Oral vs injectable Primobolan?
Same hormone. The injectable (enanthate) has a ~10.5-day half-life and twice-weekly dosing; the oral acetate clears in ~5 hours and needs daily dosing. Critically, the oral isn't 17-alpha-alkylated, so much of each dose never reaches circulation — expect a weaker effect per milligram.
Is oral Primo liver-safe?
Safer than alkylated orals, not free of risk. The 1-methyl structure avoids the severe hepatotoxicity of 17-alpha-alkylated compounds, so it rates mild here, but any oral AAS can still move liver enzymes and lipids.
Why is oral Primobolan expensive to run?
Poor oral bioavailability. Without 17-alpha-alkylation the liver clears most of each dose, so reported protocols use 50–100 mg daily for effects the injectable matches at a fraction of the milligrams.
References
- Llewellyn Anabolics (11th ed.) — Cmax calibrated to ng/dL serum peak. Oral methenolone acetate PK extrapolated from injectable.
- Llewellyn, ANABOLICS (methenolone reference) — Reference text behind the PK calibration; human PK literature on oral methenolone is otherwise sparse.
Related compounds
Primobolan (Injectable)
Injectable methenolone enanthate; very long half-life, mild profile. Peak calibrated.
Testosterone Enanthate
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
Testosterone Cypionate
Standard US TRT ester with a slightly longer release tail than enanthate. Steady state ~4–5 weeks.
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