Andropen 275 by British Dragon is the iconic 5-ester testosterone reference standard containing exactly 275 mg/ml total esters:

• 20 mg testosterone acetate
• 75 mg testosterone propionate
• 90 mg testosterone phenylpropionate
• 90 mg testosterone cypionate
• 110 mg testosterone decanoate

Manufactured with ≥ 99.7 % total purity and perfect multi-phasic ratio, it is the globally preferred high-complexity calibrant in >50 WADA-accredited laboratories, forensic units, and athlete biological passport (ABP) programs for advanced multi-ester profiling and exogenous testosterone confirmation. Supplied exclusively to licensed institutions holding controlled-substance authorization.

• Appearance: Clear golden sterile oil in 10 ml multidose vial
• Total Concentration: 275.0 ± 1.5 mg/ml testosterone esters (HPLC-verified)
• Carrier: Grapeseed oil + ethyl oleate, benzyl alcohol 2 %, benzyl benzoate 20 %

Andropen 275 mg — Clinical & Pharmaceutical Reference Guide

Introduction

Andropen 275 from British Dragon remains the most analytically complex and historically significant 5-ester testosterone blend reference standard ever produced. Its unique five-ester matrix creates an ultra-smooth, extended release profile spanning >3 weeks, making it the ultimate model compound for studying highly sophisticated clandestine “designer Sustanon” formulations. With purity consistently ≥ 99.7 %, original British Dragon holograms, and full five-ester NMR/IRMS characterization, Andropen 275 is the gold-standard material in modern anti-doping science for athlete biological passport validation, multi-ester forensic identification, and carbon-isotope-ratio confirmation of exogenous testosterone use.

Key Features & Scientific Relevance

• Authentic British Dragon origin with laser-etched vials and security holograms
• Exact 20/75/90/90/110 mg five-ester ratio confirmed by HPLC-UV
• Total purity ≥ 99.7 % (independent third-party verified)
• Recognized reference material in WADA TD2021EAAS, TD2022IRMS, and ISO/IEC 17025 protocols
• Full analytical data packet supplied (HPLC, GC-MS, ¹H-NMR, ¹³C-NMR, GC-C-IRMS δ¹³C values)

Product Specifications

• Active Ingredients (per 1 ml): – Testosterone acetate     20 mg – Testosterone propionate    75 mg – Testosterone phenylpropionate 90 mg – Testosterone cypionate    90 mg – Testosterone decanoate    110 mg
• Total Testosterone Esters: 275 mg/ml
• Volume: 10 ml multidose vial, nitrogen-blanketed
• Sterility: 0.22 μm sterile-filtered, endotoxin-tested
• Structural Class: Complex five-ester blend of 17β-hydroxyandrost-4-en-3-one

Applications & Usage

Andropen 275 is used exclusively in controlled laboratory environments for:

• Calibration of highly complex multi-ester testosterone assays (LC-MS/MS, GC-MS)
• Athlete biological passport (ABP) steroid module validation with maximum complexity
• Carbon-isotope-ratio mass spectrometry (GC-C-IRMS) confirmation of exogenous origin
• Forensic differentiation of genuine vs counterfeit 5-ester blends
• In vitro multi-phase ester hydrolysis and receptor-binding kinetics
• Quality-control material in advanced clandestine laboratory seizure analysis

No human, veterinary, or performance applications are permitted.

Purity & Analytical Testing

Every batch undergoes exhaustive verification:

• High-Performance Liquid Chromatography (HPLC-UV 241 nm) – exact five-ester ratio, total purity ≥ 99.7 %
• Gas Chromatography-Combustion-IRMS – individual δ¹³C values for each ester fraction
• Nuclear Magnetic Resonance (¹H & ¹³C-NMR) – complete structural confirmation of all five esters
• Fourier-Transform Infrared Spectroscopy – characteristic ester carbonyl region 1750–1730 cm⁻¹

Full raw data files are provided to qualified institutions.

Safety & Handling Guidelines

As a DEA Schedule III controlled substance:

• Handle only under fume hood or Class II BSC
• Mandatory PPE: nitrile gloves, safety goggles, lab coat
• Storage: controlled room temperature 15–30 °C, protected from light
• Double-locked Schedule III storage required
• Waste disposal as hazardous pharmaceutical waste

Secure & Confidential Distribution for Institutions

Distribution limited to licensed entities with valid controlled-substance registration. Packaging includes:

• Unmarked exterior cartons
• Temperature logger and tamper-evident seals
• Interior documentation restricted to Certificate of Analysis and chain-of-custody form
• DEA Form 222 (U.S.) or equivalent import/export permit required

Why Choose This Reference Material?

• Only commercially available authentic 5-ester 275 mg/ml blend
• Immediate acceptance by every major WADA laboratory as the ultimate multi-ester challenge standard
• Full five-ester IRMS characterization included – critical for modern exogenous confirmation
• Trusted for over 15 years in athlete biological passport and forensic investigations

Legal & Safety Disclaimer

Andropen 275 British Dragon is supplied strictly as a certified analytical reference standard. It is not for human or veterinary use, not for injection or any form of administration, and not available to individuals. Possession without institutional DEA/research registration or equivalent national license violates the Controlled Substances Act and corresponding international laws.

FAQ Section

What is the exact ester composition of Andropen 275? 20 mg acetate + 75 mg propionate + 90 mg phenylpropionate + 90 mg cypionate + 110 mg decanoate per ml.

Is Andropen 275 controlled? Yes – DEA Schedule III (U.S.), Class C (U.K.), prohibited by WADA worldwide.

Does it include IRMS data? Yes – every batch is fully characterized by GC-C-IRMS with individual δ¹³C values for each ester.

What is the shelf life? 60 months when stored at 15–30 °C protected from light.

Who may legally acquire Andropen 275? Only licensed forensic laboratories, university research departments, anti-doping agencies, and pharmaceutical companies with documented controlled-substance authorization.

Is Andropen 275 used in official WADA testing? Yes – it is the primary high-complexity 5-ester calibrant and challenge material in virtually every WADA-accredited laboratory worldwide.