- Manufacturer: Dragon Pharma
- Substance: Testosterone Undecanoate
- Dosage: 250 mg/ml
- Form:Injection
- Packing: 10 ml
- Brand Name: Nebido
Shipping From
Undecanoate 250 by Dragon Pharma is the longest-acting injectable testosterone ester available — delivering a massive 250 mg/ml of pure Testosterone Undecanoate in a 10 ml vial. With an active life of up to 12–16 weeks from a single injection, it is the ultimate solution for stable, hassle-free hormone replacement therapy (HRT) or long-term testosterone base in advanced cycles.
What It Is
Testosterone Undecanoate is an extremely long-chain ester attached to testosterone, originally developed for clinical TRT under the brand name Nebido/Andriol. Dragon Pharma's version provides pharmaceutical-grade purity at 250 mg/ml, allowing months of elevated testosterone levels from just one or two injections per cycle.
How It Works
After intramuscular injection (preferably gluteal), testosterone undecanoate is slowly released from the oil depot over weeks due to its massive 11-carbon ester chain. This provides smooth, steady blood levels without the peaks and troughs of shorter esters like enanthate or cypionate. It aromatizes normally, supporting libido, mood, and muscle-building effects while minimizing injection frequency.
Undecanoate 250 Benefits
- Ultra-Long Action: 10–16 weeks of stable testosterone from one injection
- No Frequent Pinning: Ideal for those who hate weekly shots
- Perfect TRT/Base: Smooth levels for health, libido, and gains
- Minimal Estrogen Spikes: Gradual release = easier to control aromatization
- High Concentration: Only 4 ml needed for a 1000 mg dose
Who It's For
Perfect for men 21+ on long-term TRT, cruise protocols, or advanced blast cycles who want to minimize injections. Excellent as a year-round testosterone base when combined with short-ester orals/injectables. Not ideal for short contest cycles due to extremely long detection time and slow clearance.
How to Use
TRT/Cruise: 2–4 ml (500–1000 mg) every 10–14 weeks
Blast Base: 4–8 ml (1000–2000 mg) every 10–12 weeks
Injection Site: Deep intramuscular gluteal (1.5–2 inch needle) — aspirate carefully
First-time loading: Many users front-load 4 ml + 4 ml four weeks later for faster saturation
Stacking Suggestions
- Year-Round Base: Undecanoate 250 + low-dose Deca or Primo for joints/mass
- Lean Bulk: Undecanoate 250 + Dianabol or Anadrol first 6 weeks
- TRT + Kickstart: Undecanoate 250 + Testosterone Propionate first 4 weeks
Side Effects
- Estrogenic: gynecomastia, water retention (use low-dose AI if needed)
- Androgenic: acne, hair loss, prostate enlargement (in predisposed)
- Hematocrit/hemoglobin elevation — donate blood regularly
- Very long detection time (18+ months)
- Injection site pain possible due to high volume
Post Cycle Therapy (PCT)
PCT should begin only after testosterone levels drop below baseline — typically 14–20 weeks after last injection. Standard SERM protocol (Clomid/Nolvadex) + HCG if needed. Blood work is mandatory to time PCT correctly.
Frequently Asked Questions
How long does one injection of Undecanoate 250 last?
A single 4 ml (1000 mg) injection typically maintains elevated testosterone levels for 10–16 weeks, depending on individual metabolism.
Can I use Undecanoate 250 for a short 12-week cycle?
Not recommended — clearance takes months. It is designed for long-term TRT or extended cycles only.
How often do I really need to inject Dragon Pharma Undecanoate 250?
Most users inject 4 ml every 10–12 weeks. Some stretch to 14–16 weeks with stable blood work.
Is Testosterone Undecanoate detectable in drug tests?
Yes — it has one of the longest detection times of any steroid (up to 18+ months).
Do I still need an AI with Undecanoate 250?
Usually minimal. The slow release rarely causes estrogen spikes, but sensitive users may use 0.25 mg Arimidex E7D–E10D.
