Stanozolol vs Testosterone Undecanoate
A side-by-side research comparison of Stanozolol and Testosterone Undecanoate across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Stanozolol | Testosterone Undecanoate |
|---|---|---|
| Full name | Stanozolol (Winstrol) | Testosterone Undecanoate (Ultra-Long Ester) |
| Category | Anabolic Steroids | Anabolic Steroids |
| Status | FDA-approved drug (controlled substance) | FDA-approved drug (controlled substance) |
| Mechanism | Stanozolol is a 17-alpha-alkylated DHT derivative that is orally active and resists aromatization. It has a relatively high anabolic-to-androgenic ratio and lowers sex-hormone-binding globulin (SHBG), increasing free hormone levels. | 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 | 328.5 Da | 456.7 Da |
| Half-life | ~9 hours (oral), ~24 hours (injectable) | ~20-34 days (injection depot) |
| Bioavailability | Oral or intramuscular injection | Deep IM injection or oral (lymphatic absorption) |
| Typical dose | Medical: variable for angioedema | Injection every ~10-14 weeks (medical); oral 2x daily with food |
| Frequency | Daily (oral) | Infrequent (injection) or twice daily (oral) |
| Route | Oral tablet or aqueous injection | Deep intramuscular injection or oral |
Stanozolol reported benefits
- Lean, dry strength gains
- No water retention
- Lowers SHBG (more free hormone)
- Treats hereditary angioedema (medical)
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.