Testosterone Undecanoate
$85.00
Nebidosyn 200 (Testosterone Undecanoate) is an ultra-long-acting injectable testosterone designed for stable hormone levels and low-frequency injections. Ideal for TRT, cruise phases, or long-term cycles with minimal hormonal fluctuation.
200mg / mL
- Usage: 200–250 mg every 7–10 days, or 1000 mg every 10–14 weeks
- Cycle Duration: 10–16 weeks, or ongoing for TRT
- Aromatization: Yes – Aromasin 12.5 mg EOD as needed
- Post Cycle Therapy: Begin 3–4 weeks after last injection if not on TRT
- Stack With: Primobolan, EQ, Deca, or Anavar for long, smooth cycles
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What is Nebidosyn 200 (Testosterone Undecanoate) by SYN Pharma?
Nebidosyn 200 by SYN Pharma delivers 200 mg/mL of Testosterone Undecanoate — a long-acting injectable testosterone ester designed for steady, sustained release over extended periods. Commonly known by trade names such as Nebido or Andriol (oral version), this compound is unique in that it bypasses liver metabolism by being absorbed through the lymphatic system when taken orally, and offers extreme dosing convenience in injectable form.
As one of the longest esters available, Testosterone Undecanoate is popular in TRT protocols and long-cycle approaches due to its low injection frequency and stable blood hormone levels. Users experience smooth energy, libido enhancement, and consistent anabolic activity with minimal hormonal fluctuation.
Benefits of Testosterone Undecanoate
- Ultra-long half-life allows for monthly or biweekly injections
- Consistent hormone levels without frequent spikes
- Ideal for TRT, cruise phases, or low-maintenance cycles
- No liver toxicity — bypasses hepatic metabolism entirely
- Supports lean mass, mood, libido, and recovery
Product Details
- Compound: Testosterone Undecanoate
- Strength: 200 mg/ml
- Volume: 10 ml vial
- Total Content: 2000 mg per bottle
- Half-Life: ~18–21 days
- Injection Frequency: Every 10–21 days (depending on dose)
Recommended Usage
- TRT Protocol: 1000 mg every 10–14 weeks
- Performance Dose: 200–250 mg every 7–10 days
- Cycle Duration: 10–16 weeks (or ongoing for TRT)
- Aromatization: Yes — AI (e.g., Aromasin 12.5 mg EOD) may be required
10-Week Low-Maintenance Testosterone Cycle
| Week | Nebidosyn (mg/week) | Injection Frequency | AI & Support |
| 1 | 400 | Twice (200 mg Mon/Thurs) | Aromasin 12.5 mg EOD |
| 2–4 | 250 | 1x per week | NAC, Vitamin D, Omega-3 |
| 5–10 | 250 | 1x every 10 days | Monitor estrogen & hematocrit |
Post Cycle Therapy (If Not on TRT)
- Start: 3–4 weeks after last injection (long half-life)
- Clomid: 50/50/25/25 mg (4 weeks)
- Or: Nolvadex 40/40/20/20 mg
Common Questions About Nebidosyn
What makes Testosterone Undecanoate different?
Its long half-life allows for low-frequency injections while maintaining stable testosterone levels. It’s commonly used in medical TRT settings and by advanced users looking for a smoother ride with fewer peaks and crashes.
Can it be used in a cycle?
Yes. It can serve as the base testosterone in long ester stacks, though it’s more common in low-maintenance or TRT-style protocols. Faster-acting esters may be preferable for aggressive bulking or cutting cycles.
Do I need an AI?
Yes, especially at higher doses. Testosterone Undecanoate does aromatize, so managing estrogen with an aromatase inhibitor like Aromasin is advised.
Can I combine this with other compounds?
Yes. It stacks well with EQ, Deca, Primo, or even short esters like Tren Ace (if strategically timed). Due to its smooth profile, it’s a reliable base compound in nearly any cycle.
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