Testosterone Undecanoate

What is Nebidosyn 200 (Testosterone Undecanoate) by SYN Pharma?

Nebidosyn 200 is SYN Pharma’s long-acting injectable version of Testosterone Undecanoate, delivering 200 mg/ml in a 10 ml vial. Known for its extremely extended release profile, this ester allows for stable testosterone levels with fewer injections. Testosterone Undecanoate is also available in oral form under the name Andriol, which bypasses the liver via the lymphatic system. In its injectable form, it is often used for hormone replacement therapy and long, steady anabolic cycles.

This ester is ideal for users looking for smooth, long-term testosterone support with minimal injection frequency and consistent blood levels. It is best suited for experienced users or TRT-style protocols.

Benefits of Testosterone Undecanoate

• Ultra-long ester provides smooth, consistent hormone levels
• Minimal injection frequency (every 10–14 days)
• Supports lean mass, strength, libido, and recovery
• Low estrogenic volatility due to stable delivery

Product Details

• Compound: Testosterone Undecanoate
• Concentration: 200 mg/ml
• Volume: 10 ml per vial
• Total Content: 2000 mg per bottle
• Injection Frequency: Every 10 to 14 days

Dosage and Administration

The most common dosing protocol for Testosterone Undecanoate is 1000–1200 mg every 10 to 14 days. In bodybuilding settings, some users inject 200–400 mg weekly to elevate blood levels while still maintaining a smooth delivery curve. It is not fast-acting and should not be used for short cycles.

Due to its slow release, this ester is often used for long cycles (10–16+ weeks) or part of a TRT-style protocol. Aromatase inhibitors may be used as needed depending on estrogen response.

10-Week Testosterone Undecanoate Cycle Example

Common Questions About Nebidosyn 200

How often do I need to inject Testosterone Undecanoate?

Medical TRT protocols use one injection every 10–14 days. Bodybuilders may inject 1–2 times per week to maintain higher levels. This compound is designed for long-acting, slow-release use.

How is this different from Andriol (oral testosterone)?

Oral Andriol also uses Undecanoate, but is absorbed through the lymphatic system. Injectable Testosterone Undecanoate bypasses the liver completely and allows for larger doses with better absorption and stability.

Is Nebidosyn 200 suitable for beginners?

This ester is better suited for experienced users or those looking for minimal injection frequency. Beginners may prefer Testosterone Enanthate or Cypionate due to easier dose control and timing.

Is post-cycle therapy required?

Yes. Like all testosterone compounds, it suppresses natural testosterone. Begin PCT approximately 3–4 weeks after the final injection using Nolvadex, Clomid, or a full recovery protocol depending on dosage and duration.