Testosterone Propionate Description:
Testosterone propionate is a key male sex hormone, essential for the development of reproductive tissues in men, such as the testes and prostate, and for regulating secondary sexual characteristics, including increased muscle mass, bone density, and body hair growth. In women, testosterone also contributes to overall health and the prevention of osteoporosis. Low testosterone levels in men can cause bone fragility and loss of muscle mass. Testosterone propionate has strong anabolic properties: it promotes protein synthesis, accelerates muscle recovery, and improves glycogen storage in muscles. For these reasons, it is used both in hormone replacement therapy for men with hypogonadism and by athletes as a base during steroid cycles.

Mechanism of action:
Testosterone propionate binds to androgen receptors and also acts as a precursor to dihydrotestosterone (DHT), an active androgen that binds to receptors with five times greater potency. This binding triggers changes at the cellular level that regulate gene expression and promote androgenic and anabolic effects. Additionally, testosterone can be converted into estrogen, which modulates feedback on the hypothalamic-pituitary-testicular axis, suppressing endogenous testosterone production when exogenous hormones are administered.

Medical use:
Testosterone propionate is an essential drug according to the WHO, used to treat male hypogonadism, gender dysphoria, and some types of breast cancer. In men, the decline in testosterone with age can be offset with replacement therapy (HRT or TRT), which maintains hormone levels within the physiological range, improving well-being, mood, sexual function, and body composition.

Testosterone Propionate in Sports
: In bodybuilding and sports, testosterone propionate is valued for its ability to increase muscle mass, strength, and endurance by stimulating anabolic and androgenic activity. It promotes nitrogen retention in muscles and contributes to fat burning. Dosages vary based on experience: beginners 50 mg every other day, medium dosage 100–150 mg EOD, high dosage over 100 mg daily. Testosterone propionate’s half-life is approximately 20 hours, with recommended administration every 1–2 days.

Main effects

• Increased muscle mass

• Body fat reduction

• Improved strength and endurance

• Increased libido and male sexual function

• Stimulation of erythropoiesis and bone metabolism

Side effects

• Water retention

• High blood pressure

• Aggression or irritability

• Acne and hair loss

• Masculinization in women

Pharmaceutical profile

• Form: oily solution for intramuscular injection

• Frequency of injections: every 1–2 days

• Storage: 8–30°C, away from light and out of the reach of children