Methenolone Enanthate vs Testosterone Undecanoate
A side-by-side research comparison of Methenolone Enanthate and Testosterone Undecanoate across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Methenolone Enanthate | Testosterone Undecanoate |
|---|---|---|
| Full name | Methenolone (Primobolan) | Testosterone Undecanoate (Ultra-Long Ester) |
| Category | Anabolic Steroids | Anabolic Steroids |
| Status | Prescription drug (controlled substance) | FDA-approved drug (controlled substance) |
| Mechanism | Methenolone is a DHT derivative with modest anabolic and low androgenic activity. It does not aromatize and is generally well tolerated, though the oral acetate form is not 17aa and survives via a 1-methyl group, giving lower liver stress than typical orals. | The large undecanoate ester dramatically slows release, giving weeks-long duration from a single injection. Oral undecanoate is absorbed via the lymphatic system, partly bypassing first-pass liver metabolism. |
| Molecular weight | 414.6 Da (enanthate) | 456.7 Da |
| Half-life | ~5-7 days (enanthate) | ~20-34 days (injection depot) |
| Bioavailability | Intramuscular injection or oral | Deep IM injection or oral (lymphatic absorption) |
| Typical dose | Lean-gain cycles (non-medical) | Injection every ~10-14 weeks (medical); oral 2x daily with food |
| Frequency | Weekly (injectable) or daily (oral) | Infrequent (injection) or twice daily (oral) |
| Route | Intramuscular injection or oral tablet | Deep intramuscular injection or oral |
Methenolone Enanthate reported benefits
- Lean, quality gains
- Low side-effect profile (relative)
- No aromatization
- Preserves lean mass in a deficit
- Mild on liver (oral acetate)
Testosterone Undecanoate reported benefits
- Very infrequent injections (convenience)
- Stable long-term testosterone (medical)
- Oral option avoids most liver toxicity
- Restores testosterone in deficiency
Related comparisons
Research and educational reference only. Not medical advice.