Testosterone Undecanoate vs Trestolone Acetate
A side-by-side research comparison of Testosterone Undecanoate and Trestolone Acetate across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Testosterone Undecanoate | Trestolone Acetate |
|---|---|---|
| Full name | Testosterone Undecanoate (Ultra-Long Ester) | Trestolone Acetate (MENT) |
| Category | Anabolic Steroids | Anabolic Steroids |
| Status | FDA-approved drug (controlled substance) | Investigational (controlled substance) |
| Mechanism | 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. | MENT has a 7-alpha-methyl group that prevents 5-alpha-reduction, so it stays highly active in tissues without converting to DHT. It is many times more potent than testosterone, aromatizes to estrogen, and strongly suppresses gonadotropins (its contraceptive basis). |
| Molecular weight | 456.7 Da | 344.5 Da (acetate) |
| Half-life | ~20-34 days (injection depot) | ~short (acetate ester) |
| Bioavailability | Deep IM injection or oral (lymphatic absorption) | Intramuscular injection or implant |
| Typical dose | Injection every ~10-14 weeks (medical); oral 2x daily with food | Very potent; low absolute doses |
| Frequency | Infrequent (injection) or twice daily (oral) | Daily to every other day (acetate) |
| Route | Deep intramuscular injection or oral | Intramuscular injection or subdermal implant |
Testosterone Undecanoate reported benefits
- Very infrequent injections (convenience)
- Stable long-term testosterone (medical)
- Oral option avoids most liver toxicity
- Restores testosterone in deficiency
Trestolone Acetate reported benefits
- Very high anabolic/androgenic potency
- No DHT conversion
- Supports libido strongly
- Studied for male contraception/HRT
Related comparisons
Research and educational reference only. Not medical advice.