≥99% HPLC Purity MS Confirmed Janoshik COA In-House SPPS 8-Region Worldwide Shipping
Compound type: Ultra-Long-Acting Testosterone Ester — AR Agonist (~34-day half-life) CAS Number: 5949-44-0
What is Testosterone Undecanoate?
Testosterone Undecanoate (TU) is the longest-acting injectable testosterone ester, with a half-life of approximately 34 days when administered in castor oil vehicle. Unlike shorter esters absorbed directly into systemic circulation, TU is absorbed via intestinal lymphatic transport, bypassing first-pass hepatic metabolism. The extremely long half-life enables once-monthly or once-every-10-week injection intervals (as in Nebido TRT), producing stable testosterone levels after loading dose. Key clinical pharmacokinetics data from the NEBIDO brand provides a reference PK model for ultra-long-acting androgen research.
Why does Testosterone Undecanoate have such a long half-life?
The undecanoate ester is the longest carbon chain (C11) among common testosterone esters, dramatically slowing hydrolysis. When formulated in castor oil, TU is absorbed via intestinal lymphatics (bypassing hepatic first pass), further extending plasma half-life to ~34 days — enabling once-monthly injection intervals.
How is Testosterone Undecanoate supplied?
QSC Testosterone Undecanoate is supplied as a ready-to-use oil-based injectable solution in castor oil vehicle. No reconstitution required. The castor oil vehicle is more viscous than sesame or MCT oil — warm slightly and use a larger gauge needle for drawing.
What purity is QSC Testosterone Undecanoate?
QSC Testosterone Undecanoate is ≥99% HPLC pure with MS-confirmed identity on every batch. COA verifiable at verify.janoshik.com.
Research Use Only: All QSC compounds are sold strictly for laboratory research purposes only. Not for human consumption, veterinary use, or any other application. Researchers are responsible for compliance with local regulations.
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