What is testosterone?

Testosterone is the primary male sex hormone and anabolic steroid that is essential for normal growth and development, especially the development of male reproductive tissues and secondary sexual characteristics. In men, testosterone plays key roles in maintaining:

Where is testosterone produced?

Most testosterone is produced in the testes in men. But some testosterone is also produced by the adrenal glands in both sexes. The pituitary gland in the brain releases luteinizing hormone (LH) that signals the testes to produce more testosterone.

What causes low testosterone?

As a man ages, testosterone levels tend to decline steadily. But certain medical conditions or medications can also lead to low T at any age, including:

What are the symptoms of low testosterone?

Symptoms of low T may include:

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