Testosterone Cypionate vs Liothyronine (T3)
A side-by-side research comparison of Testosterone Cypionate and Liothyronine (T3) across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Testosterone Cypionate | Liothyronine (T3) |
|---|---|---|
| Full name | Testosterone Cypionate (Depo-Testosterone) | Liothyronine Sodium (Cytomel) |
| Category | Hormone Replacement | Hormone Replacement |
| Status | FDA Approved (Schedule III) | Prescription medication |
| Mechanism | Exogenous testosterone binds androgen receptors in muscle, bone, brain, and reproductive tissues. The cypionate ester provides slow release from the injection depot, maintaining physiologic levels between doses. | Binds nuclear thyroid receptors to regulate gene transcription for basal metabolic rate, thermogenesis, protein synthesis, and carbohydrate/fat metabolism in virtually every tissue. |
| Molecular weight | 412.61 Da | 650.97 Da |
| Half-life | ~8 days | ~2.5 days |
| Bioavailability | ~100% (intramuscular) | ~95% oral |
| Typical dose | 100-200 mg | 5-25 mcg |
| Frequency | Weekly or split biweekly | Daily (split AM/PM) |
| Route | Intramuscular or subcutaneous injection | Oral tablet or sustained-release capsule |
Testosterone Cypionate reported benefits
- Restored libido and sexual function
- Increased lean muscle mass
- Improved bone density
- Enhanced mood and cognitive clarity
- Reduced visceral fat
- Improved energy and motivation
Liothyronine (T3) reported benefits
- Metabolic rate increase
- Weight loss support
- Improved energy
- Better mood
- Reduced brain fog
- Enhanced fat oxidation
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Research and educational reference only. Not medical advice.