Anabolic Steroids/Hormones
Testosterone Undecanoate (Castor Oil)
Nebido · TU · Reandron
Very long-acting ester (Nebido). Dosed 1000 mg every 10–14 weeks for TRT. NHS standard.
🚧 Expanded guide coming soon. This compound has PK data and a source — a full overview, mechanism, and dosing guide is pending editorial review.
Pharmacokinetic summary
- Model tier
- Advanced (t½ + Cmax + Tmax + F)
- Half-life
- 34 days
- Cmax
- 800 ng/dL
- Tmax
- 10.0 days
- Bioavailability
- 65%
- Typical dose
- 750–1000 mg
Harm reduction
- Aromatizes
- Yes
- DHT derivative
- No
- Injection frequency
- Every 10–14 weeks
Related compounds
Testosterone Enanthate
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
Testosterone Cypionate
Standard US TRT ester with a slightly longer release tail than enanthate. Steady state ~4–5 weeks.
Testosterone Propionate
Short-acting ester with sharp peaks; requires frequent injection. Useful for frontloading.
Protocols featuring Testosterone Undecanoate (Castor Oil)
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