Dianabol Cycle Pharma TRT

What Is Testosterone?

How It’s Used in Medicine – and How it Can Be Misused



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1. The Basics of Testosterone


Hormone, not a drug – Testosterone (T) is an endogenous steroid hormone produced mainly by the testes in men and by smaller amounts in women’s ovaries and adrenal glands.
Key functions – It drives the development of male secondary sex characteristics (deep voice, facial hair), supports muscle mass, bone density, red‑blood‑cell production, libido, mood, and overall energy.
Normal ranges – In adult men, total testosterone usually falls between about 300–1000 ng/dL. Women have roughly 30–70 ng/dL. These numbers vary with age, assay methods, time of day (higher in the morning), and individual lab reference intervals.



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2. When is "low" testosterone a real problem?


Low testosterone can be:




Category Typical causes Symptoms to watch for


Physiological aging Natural decline after age ~30–40 (often called "late-onset hypogonadism") Gradual loss of muscle mass, increased body fat, reduced libido, mild fatigue


Primary testicular failure Klinefelter syndrome, mumps orchitis, testicular cancer/therapy, genetic mutations (e.g., AR gene) Severe erectile dysfunction, infertility, gynecomastia


Secondary (hypothalamic/pituitary) Pituitary tumors, pituitary surgery/radiation, hypothalamic disease, medications (steroids), systemic illnesses (diabetes, obesity) Variable testosterone levels; often normal LH/FSH but low testosterone


Chronic conditions Obesity, type 2 diabetes, metabolic syndrome Low testosterone, increased aromatase activity leading to higher estrogen


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4. How Testosterone Levels Relate to Sexual Function



Aspect Findings


Erectile function (ED)