MESTEROLONA · 50 MG | Andrógeno DHT Rendimiento y Vitalidad Masculina

Mesterolone 50 mg tablets, from Pharma Kinetix, made in the Czech Republic. Each package contains 100 tablets of 50 mg each. This is a pharmaceutical-grade androgen product intended for human use. The active ingredient is Mesterolone, a synthetic androgen and anabolic-androgenic steroid (AAS) that is a derivative of dihydrotestosterone (DHT). Acts as a potent androgen receptor agonist with a relative binding affinity (RBA) of 25. Does not aromatize to estrogens. Indicated for the treatment of hypogonadism, oligospermia, loss of libido, and erectile dysfunction related to androgen deficiency. CAS: 1424-00-6. Molecular formula: C₂₀H₃₂O₂. Store at 2-8°C in a dry place protected from light. WARNING: This product is a prescription medication. It is classified as a Schedule III controlled substance in the United States. Its use must be supervised by a physician.

Mesterolone is a synthetic androgen and anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT), developed in the 1960s for the treatment of androgen deficiencies . Its chemical name is 1α-Methyl-4,5α-dihydrotestosterone, with molecular formula C₂₀H₃₂O₂ and a molecular weight of 304.467 g/mol . Unlike other androgens, mesterolone does not aromatize (convert to estrogen), meaning it lacks estrogenic effects . It is characterized by having a strong androgenic effect but a weak anabolic effect, making it useful primarily for its masculinizing effects rather than muscle-building properties . Its mechanism of action is based on its function as an agonist of the androgen receptor (AR), the biological target of androgens such as testosterone and DHT . Upon binding to the androgen receptor in the cytoplasm, it induces a conformational change that allows its translocation to the nucleus, where it dimerizes and binds to androgen response elements (AREs) on DNA, modulating gene expression in target tissues .

The problem it solves: Androgen deficiency in males can manifest as decreased libido, erectile dysfunction, fatigue, loss of muscle mass, increased body fat, and impaired cognitive function. Mesterolone directly addresses these deficiencies by acting as a potent androgen receptor agonist, restoring androgen activity levels without the risks associated with aromatization to estrogens.

Primary Benefit: Androgenic Support and Male Vitality

At its core, Mesterolone is designed to compensate for androgen deficiency in conditions such as male hypogonadism (low testosterone due to reduced gonadal function), oligospermia (low sperm count and male infertility), loss of libido and impotence related to androgen deficiency, and the decline in physical and intellectual capacity associated with aging and lower androgen levels . It acts as an androgen receptor agonist, binding to the receptor with a relative binding affinity (RBA) of 25 in rat prostate tissue (vs. methyltrienolone as reference 100) . Mesterolone demonstrates exceptionally high affinity for sex hormone-binding globulin (SHBG), approximately four times that of DHT, which can displace endogenous testosterone and increase levels of biologically active free testosterone .

Secondary Benefits: Reproductive Function and Performance

Mesterolone's specific action on the androgen receptor offers additional benefits that impact reproductive function and physical performance:

Improved Male Fertility: Both oligospermia and Leydig cell insufficiency may be causes of infertility. Mesterolone increases sperm count and improves their quality by raising and normalizing fructose concentration in the ejaculate, contributing to increased fertilization possibilities . In cases of oligospermia, a dosage of 50-75 mg per day for a spermatogenesis cycle (approximately 90 days) is recommended .

Stimulation of Secondary Sexual Characteristic Development: Mesterolone stimulates the growth, development, and function of effector organs under androgenic influence, as well as the development of secondary male sexual characteristics in cases of pre-pubertal androgen insufficiency .

Improved Physical and Intellectual Capacity: Mesterolone is indicated for the reduction of physical and intellectual capacities in middle and advanced age associated with declining androgen levels, contributing to better quality of life and overall performance .

No Estrogenic Effects: By not aromatizing to estrogens, Mesterolone does not produce estrogenic side effects such as gynecomastia or fluid retention, making it an attractive option for those seeking androgenic benefits without the risks associated with estrogen conversion .

Pairing Strategy: Mesterolone

Mesterolone is typically administered as a standalone agent for the treatment of androgen deficiency. In cases of hypogonadism with reduced gonadotropinuria, an additional initial treatment with gonadotropins may be considered . Combination with other androgens or hormonal agents is not recommended without proper medical supervision.