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

  2. Testosterone - Wikipedia

  3. Testosterone therapy: Potential benefits and risks as you age

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

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

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

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

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

  9. Testosterone: Everything You Need to Know - Everyday Health

  10. Testosterone (video) | Khan Academy