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  2. Testosterone - Wikipedia

    Testosterone is the primary male sex hormone and androgen in males. [4] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles …

  3. Testosterone: What It Is and How It Affects Your Health

    Mar 17, 2023 · Testosterone is a hormone found in men, less so in women. Learn how abnormally low or high levels can impact a man's physical and mental health.

  4. Testosterone: What It Is, Function & Levels - Cleveland Clinic

    Testosterone is a hormone that your gonads (testicles or ovaries) mainly produce. Testosterone levels are naturally much higher in males.

  5. Testosterone — What It Does And Doesn't Do - Harvard Health

    Testosterone is the major sex hormone in males. It is essential to the development of male growth and masculine characteristics. Signals sent from the brain to the pituitary gland at the base of …

  6. Normal Testosterone Levels and Symptoms of an Imbalance

    Jul 27, 2024 · Learn about healthy and normal hormone and testosterone levels for both men and women—including how to test, symptoms of low testosterone, and treatment.

  7. Testosterone: Functions, deficiencies, and supplements - Medical …

    Jul 18, 2023 · Testosterone is the key male sex hormone. Its functions include regulating fertility, muscle mass, fat distribution, and red blood cell production. When levels of testosterone drop …

  8. What Is Testosterone? The Science Behind Its Impact on Your Body

    May 29, 2025 · Low testosterone (hypogonadism) is usually diagnosed after two separate early-morning testosterone blood tests, taken between 8 and 10 a.m. on different days. According to …

  9. Testosterone | Definition, Effects, & Facts | Britannica

    May 18, 2025 · testosterone, hormone produced by the male testis that is responsible for development of the male sex organs and masculine characteristics, including facial hair and …

  10. How to Naturally Increase Testosterone in Men - US News Health

    Jun 4, 2025 · Low testosterone is a common complaint for aging men, and a reason behind numerous mental and physical symptoms, such as depression, increased breast size, …

  11. High and Low Testosterone Levels in Men - MedicineNet

    High or low testosterone levels in men can cause symptoms and signs of weight gain, osteoporosis, decline in sexual desire, and a decline in physical energy and stamina. Higher …

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