Description
Overview
Androgen-receptor agonism; undecanoate is a very long ester used clinically for infrequent dosing. (Note: this catalogue miscategorizes it under Nandrolone.)
Composition / Profile
- Active compound: Testosterone Undecanoate
- Drug class: Injectable androgen / anabolic steroid (very long ester)
- Pack / dose (this listing): 10ml / 250mg
Format
- Oil-based (or aqueous, where noted) solution for intramuscular injection
- Pack / dose: 10ml / 250mg
Dosage & Usage Patterns
- Bodybuilding (commonly cited): Commonly cited: ~750–1000 mg every 10–14 days in oil-based injectable form (community protocols vary); very long ester means slow buildup and slow clearance.
- Clinical / general reference: Clinical injectable dosing is infrequent (weeks apart); individual.
- Half-life: IM oil form ~20-34 days.
- Protocols vary by individual, compound stack, and bloodwork — figures above reflect community-reported patterns, not medical recommendations.
Effects
Reported benefits (commonly cited)
- Infrequent injection schedule.
- Steady testosterone elevation once blood levels plateau.
- Used as a long-acting base in some extended cycles.
Reported side effects
- Acne.
- Water retention.
- Gynecomastia.
- Raised hematocrit.
- Injectable form carries a documented risk of pulmonary oil microembolism (POME).
Key Interactions
- Aromatizes to estradiol.
- Raises hematocrit.
Post-Cycle Considerations
- Extremely long suppression window because of slow release.
Precautions
- POME/anaphylaxis warnings exist for the clinical injectable.
- Oral undecanoate is a different formulation.
Common Misconception
Myth: it’s a nandrolone (per the catalogue path).
Evidence: it is a testosterone ester, not nandrolone.
Related Categories
- Browse more in Injectable Steroids → Testosterone → Testosterone Undecanoate.
- Related: Post Cycle Therapy (PCT), Anastrozole, Tamoxifen.
Storage
- Store away from direct light and extreme temperature
- Oil-based solutions can be drawn more easily when warmed slightly before injection






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