Oxymetholone vs Testosterone Undecanoate
A side-by-side research comparison of Oxymetholone and Testosterone Undecanoate across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Oxymetholone | Testosterone Undecanoate |
|---|---|---|
| Full name | Oxymetholone (Anadrol) | Testosterone Undecanoate (Ultra-Long Ester) |
| Category | Anabolic Steroids | Anabolic Steroids |
| Status | FDA-approved drug (controlled substance) | FDA-approved drug (controlled substance) |
| Mechanism | Oxymetholone is a 17-alpha-alkylated derivative of DHT that strongly stimulates erythropoiesis and protein synthesis. Despite its DHT origin, it can produce estrogen-like effects through a non-aromatizing mechanism, contributing to water retention. | 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 | 332.5 Da | 456.7 Da |
| Half-life | ~8-9 hours | ~20-34 days (injection depot) |
| Bioavailability | Oral | Deep IM injection or oral (lymphatic absorption) |
| Typical dose | Medical: ~1-5 mg/kg/day for anemia | Injection every ~10-14 weeks (medical); oral 2x daily with food |
| Frequency | Daily | Infrequent (injection) or twice daily (oral) |
| Route | Oral tablet | Deep intramuscular injection or oral |
Oxymetholone reported benefits
- Rapid mass and strength
- Strong red blood cell stimulation
- Treats anemia/wasting (medical)
- Increased appetite
Testosterone Undecanoate reported benefits
- Very infrequent injections (convenience)
- Stable long-term testosterone (medical)
- Oral option avoids most liver toxicity
- Restores testosterone in deficiency
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Research and educational reference only. Not medical advice.