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

    www.healthline.com/health/what-is-testosterone

    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.

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

    www.health.harvard.edu/staying-healthy/testosterone--what-it-does-and-doesnt-do

    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 the brain control the production of testosterone in men. The pituitary gland then relays signals to the testes to produce testosterone.

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

    my.clevelandclinic.org/health/articles/24101

    Testosterone is a hormone that your gonads (testicles or ovaries) mainly produce. Testosterone levels are naturally much higher in people assigned male at birth.

  5. Testosterone - Wikipedia

    en.wikipedia.org/wiki/Testosterone

    Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

  6. Normal Testosterone Levels by Age, Gender, and More - Verywell...

    www.verywellhealth.com/testosterone-levels-5212199

    Normal testosterone levels support sexual development, libido, healthy muscles and bones, and well-regulated moods. A hormone that acts as a chemical messenger, testosterone is important for both men and women. Too much or too little testosterone can lead to unwelcome symptoms.

  7. 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 below...

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

    www.britannica.com/science/testosterone

    testosterone, hormone produced by the male testis that is responsible for development of the male sex organs and masculine characteristics, including facial hair and deepening of the voice. Testosterone was isolated from testicular extracts in 1935.

  9. Facts About Testosterone: Why Do We Need It? - Healthline

    www.healthline.com/health/facts-about-testosterone

    Testosterone is an androgen hormone. It produces male characteristics in the body. Testosterone is made in the following locations: Men have higher levels of testosterone in their bodies...

  10. Understanding How Testosterone Affects Men | National Institutes...

    www.nih.gov/news-events/nih-research-matters/understanding-how-testosterone...

    Testosterone is a sex hormone that plays important roles in the body. In men, it’s thought to regulate sex drive (libido), bone mass, fat distribution, muscle mass and strength, and the production of red blood cells and sperm. A small amount of circulating testosterone is converted to estradiol, a form of estrogen.

  11. Testosterone | Hormones

    www.yourhormones.info/hormones/testosterone

    Testosterone is a hormone that is responsible for many of the physical characteristics specific to adult males. It plays a key role in reproduction and the maintenance of bone and muscle strength. Testo (brand name for testosterone formulations); 4-androsten-17β-ol-3-one. What is testosterone?