Testo-P Testosterone Propionate 150 mg/ml

• Testo P 150 – Testosterone Propionate (Royal Pharmaceuticals)
• Category: Injectable Testosterone Ester (Research Only)
• Brand: Royal Pharmaceuticals
• Concentration: 150 mg/ml testosterone propionate
• Packing: 10 1 ml ampoules
• Origin: United Kingdom
• Research Notice: Laboratory, analytical and collector use only. Not for human or veterinary administration.

What Is Testosterone Propionate?

Testosterone propionate is a short-chain ester of testosterone (testosterone 17-propanoate).

It acts as a rapid-release pro-drug, hydrolysed quickly to free testosterone after intramuscular depot formation.

Because of its fast kinetics, it is widely used in:

• Androgen receptor (AR) signalling research
• Short-duration pharmacokinetic modelling
• Anti-doping analytical calibration (LC-MS/MS, GC-MS)
• Comparative studies of short- vs long-acting testosterone esters

This profile describes the compound only as a scientific reference material.

Mechanism of Action

1. Rapid Ester Cleavage

The three-carbon propionate ester produces a short depot effect.

Free testosterone is rapidly released and enters AR-responsive tissues.

2. Androgen Receptor Activation

• Transcription of androgen-regulated genes
• Enhanced protein synthesis and nitrogen retention
• Stimulation of erythropoiesis
• Maintenance of androgen-dependent physiological pathways

3. Metabolic Pathways

Reduction to dihydrotestosterone (DHT)

Aromatisation to estradiol (E2)

4. Pharmacokinetic Characteristics

Elimination half-life is approximately 0.8–2 days, making it one of the fastest-acting testosterone esters used in research and historical clinical settings.

Research Applications

• Short-acting androgen reference compound
• Release-rate modelling vs longer esters (E, C, U)
• Control substance for steroid detection systems
• In-vitro androgen receptor activity assays
• Endocrine pathway comparison studies

Potential Research-Level Observations

• Rapid rise in androgen levels following ester cleavage
• Marked fluctuations in exposure curve compared to long esters
• Clear metabolite profile useful for analytical method development
• Short-interval AR stimulation patterns

Safety Profile & Known Risks (Class Effects)

Androgenic

• Acne, seborrhoea
• Accelerated androgenic alopecia
• Virilisation if exposed in females

Endocrine Suppression

• Reduced LH/FSH secretion
• Lower endogenous testosterone
• Impaired fertility or testicular atrophy in prolonged exposure models

Cardiometabolic

HDL reduction / LDL increase

Possible elevation in blood pressure

Injection-Related

• Common local pain (propionate esters often sting)
• Inflammation or irritation
• Risk of abscess with improper handling

Toxicological Notes

Safety Data Sheets classify testosterone propionate as:

• Carcinogenic (Category 1A)
• Reproductive toxicant (Category 2)
• Harmful if swallowed, inhaled, or in contact with skin
• Very toxic to aquatic environments

Compliance & Legal Status

• Controlled substance in many jurisdictions
• WADA S1 – prohibited at all times
• Analytical laboratories must follow institutional safety and storage protocols
• Not a dietary supplement, medication or consumer product

Technical Data Table

Intended Use

Research, analytical reference, in-vitro applications

For research and analytical use only. Not for human or veterinary administration.