What is Testosterone?

man tying his shoes Knee Strengthening


Testosterone is an anabolic steroid hormone primarily secreted from the testes in males that impacts muscle growth, bone density, strength, libido, energy and cognition.


  • Testosterone increases protein synthesis needed for larger, stronger muscles along with recovery capacity. It affects motivation.
  • Natural testosterone levels peak in the late teens to early 20s, then steadily decline. Lifestyle factors influence testosterone levels.
  • Resistance training, high protein intake, vitamin D, zinc and magnesium support healthy testosterone for performance and health.
  • Symptoms of low testosterone include low energy, reduced libido, decrease in muscle and bone mass, and erectile dysfunction.


  • Adding heavy compound lifts to increase natural testosterone levels.
  • Older men supplementing clinically low testosterone under a doctor’s care.

Related Terms

  • Androgens, anabolic steroids, hormone optimization, hypogonadism

Common Questions

  • What are symptoms of low testosterone? Fatigue, depressed mood, low libido, less strength and endurance.
  • How can I boost testosterone naturally? Lift weights, HIIT, avoid excess body fat, get adequate sleep, take vitamins D, magnesium and zinc.

Do Not Confuse With

  • Estrogen – The primary female sex hormone. Men require balanced estrogen too.
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