Testosterone undecanoate is a long-acting synthetic form of testosterone, the primary male sex hormone. Testosterone drives the normal growth and development of the male reproductive organs and secondary sex characteristics — the penis, testicles, prostate, body hair, deepening of the voice, and the typical pattern of muscle and fat distribution. The FDA approved testosterone undecanoate in March 2014.
Testosterone Undecanate 10ml/250mg Test Undecanate
€65.00
Testosterone Undecanoate — long-ester injectable, 250 mg/ml
Testosterone undecanoate is the longest-acting injectable testosterone ester available, with a half-life pushing 20–30 days depending on the vehicle. Each millilitre carries 250 mg of active hormone, which makes dose planning on a weekly or fortnightly rhythm very manageable.
Clinically it is used in TRT settings with injections every 10–14 weeks. In performance protocols, weekly doses of 250–500 mg are more typical, giving steadier serum levels than shorter esters without the frequent injection load. Blood levels take several weeks to build to peak.
Suited to users who prefer fewer injections, who travel often, or who simply dislike the pin frequency of propionate-based protocols. Patient start — the ramp is slow, which is part of the appeal.
100 in stock (can be backordered)
Buy It NowTestosterone Undecanoate carries the longest ester in common use — a half-life of around 20–21 days when administered intramuscularly. One injection every two to three weeks maintains steady serum testosterone at TRT doses; higher cycle doses tend to split pinning across weekly intervals for finer control. The oil carrier (castor-based) is thicker than most, so a 21-gauge needle is sensible on draw. Not a typical cycle backbone — more a TRT or bridge compound where stable, long-interval dosing is the aim.
| Substance | Testosterone Undecanoate |
| Strength | 250 mg per ml |
| Vial size | 10 ml |
| Form | Oil-based intramuscular depot |
| Half-life | Long — about 20 days |
| Typical dose | 250–1000 mg every 7–14 days |
| Storage | Room temperature, protect from light |
Testosterone Undecanoate at 250 mg/ml — the long-chain ester version, often used in TRT settings for its monthly injection schedule.
Clinical protocols sit around 1000 mg every ten to fourteen weeks; off-label performance use typically runs 500–1000 mg every 10–14 days. The very slow release gives a flat, stable curve — no injection-day peaks or troughs to speak of. Patience is required: effects build over weeks, not days.
Frequently Asked Questions
What is Testosterone Undecanoate and how is it used?
Testosterone Undecanoate is a very long-ester testosterone, often injected once every 10–14 days. Weekly equivalents sit between 250 and 500 mg.
How often is Testosterone Undecanoate injected?
A standard Testosterone Undecanoate cycle lasts 12 weeks or longer.
What dose of Testosterone Undecanoate is typical per shot?
A typical dose is around 250 mg weekly for a cruise, higher on cycle, injected every two to three weeks.
How is Testosterone Undecanoate best stacked with other compounds?
It pairs with almost anything: a basic test-plus-oral combo for beginners, test-plus-Deca-plus-oral for size, test-plus-tren for cutting.
Why is Testosterone Undecanoate injected less often?
The undecanoate ester has one of the longest release profiles in the testosterone family, so injections can be spaced every 2–4 weeks.








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