Testosterone Undecanoate (Nebido/Aveed)
un-dek-AN-oy-eat
Category
Compound type
Phase / Status
FDA approved (Aveed). Available as Nebido internationally. Standard TRT option in Europe. The 'lazy man's testosterone' that's been around since 2014.
Standard Dose
Every 10-14 weeks (maintenance), monthly (loading)
Half-life
Plasma elimination
Route(s)
Intramuscular, Subcutaneous or Oral
Research Stage
Regulatory approval granted; post-market monitoring ongoing.
Overview
Nebido/Aveed is a long-acting testosterone injection. After the initial loading doses, dosing is commonly spaced roughly every 10-14 weeks. The intent is smoother day-to-day testosterone exposure, with fewer injections than shorter-acting esters. This is educational context only.
Plain-language summary
Nebido/Aveed is a long-acting testosterone injection. After the initial loading doses, dosing is commonly spaced roughly every 10-14 weeks. The intent is smoother day-to-day testosterone exposure, with fewer injections than shorter-acting esters. This is educational context only.
Administration Routes
- Intramuscular
- Subcutaneous
- Oral
Also known as
Mechanisms
Exogenous testosterone ester (longest ester available) - binds to androgen receptors, promotes protein synthesis. The undecanoate ester provides ultra-slow release from intramuscular injection site. Basically gives you steady testosterone for 3 months without the rollercoaster.
Detailed mechanism
Exogenous testosterone ester (longest ester available) - binds to androgen receptors, promotes protein synthesis. The undecanoate ester provides ultra-slow release from intramuscular injection site. Binds to specific hormone receptors to regulate physiological processes including metabolism, tissue repair, and cellular function.
Safety
Side effects
- Testosterone suppression (natural production)
- May convert to estrogen (gynecomastia)
- Injection site pain (thicker oil)
- Risk of embolism if injected too fast
- Hair loss (if prone)
- Increased hematocrit
- Prostate enlargement
Reported benefits
- Longest injection interval (3 months)
- Most stable T levels
- Least fluctuations
- Preferred TRT in Europe
- Lower dose frequency
- Reduced injection site trauma
Safety profile
Well-characterized safety profile from extensive clinical use and trials. Just don't abuse it and you'll be fine.
Clinical trials
Completed clinical trials leading to FDA or regulatory approval.
Structure
Verified structure
Testosterone Undecanoate (Nebido/Aveed)
No exact public structure match was confirmed, so the app will render a formula-backed illustration.
- Chemical Formula
- C31H48O3
- Molecular Weight
- 486.71 g/mol
- CAS Number
- 5949-37-9
Stack Context
Stacks with
Comparison context
Testosterone undecanoate has the longest half-life of all testosterone esters, a single injection can last 10-14 weeks. Unlike cypionate or enanthate, which require weekly injections, undecanoate is designed for extended-release TRT. The tradeoff is slower onset and less control over peak levels.
References
- 1
FDA approval data for Aveed
2014
- 2
Testosterone undecanoate TRT trials
2010
- 3View source
European Urology testosterone guidelines
2014
- 4View source
Long-acting testosterone injections and patient satisfaction
2014
- 5View source
Testosterone undecanoate pharmacokinetics
2005
This profile summarizes research literature for education only. It is not medical advice, and it does not diagnose, treat, or recommend a dose. Consult a qualified professional before changing a protocol.