Description Testosterone Propionate:
Testosterone propionate is a fundamental male sex hormone, essential for the development of reproductive tissues in men, such as the testicles and prostate, and for the regulation of secondary sexual characteristics, including increased muscle mass, bone density, and body hair growth. Even in women, testosterone contributes to overall health and the prevention of osteoporosis. Low testosterone levels in men can lead to 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 in men with hypogonadism and by athletes in steroid cycles as a base.

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 the potency. This binding activates cellular changes that regulate gene expression and promote androgenic and anabolic effects. In addition, testosterone can aromatize into estrogen, which modulates feedback on the hypothalamic-pituitary-testicular axis, suppressing endogenous testosterone production when exogenous hormones are taken.

Medical use
Testosterone propionate is an essential drug according to the WHO, used to treat male hypogonadism, gender dysphoria, and certain types of breast cancer. In men, the decline in testosterone with age can be compensated for by 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. Doses vary according to experience: beginners 50 mg every other day, average dosage 100-150 mg EOD, high dosage over 100 mg per day. The half-life of testosterone propionate is approximately 20 hours, with recommended administration every 1-2 days.

Main effects

• Increase in muscle mass

• Reduction of body fat

• Improvement in 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 alopecia

• Masculinization in women

Pharmaceutical profile

• Form: Oily solution for intramuscular injection

• Frequency of injections: 1-2 days

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