the Effects
of Testosterone
on the Body

Testosterone is an important male hormone. A male begins to produce testosterone as early as seven weeks after conception. Testosterone levels rise during puberty, peak during the late teen years, and then level off. After age 30 or so, it’s normal for a man’s testosterone levels to decrease slightly every year.

Most men have more than enough testosterone. But, it’s possible for the body to produce too little testosterone. This leads to a condition called hypogonadism. This can be treated with hormonal therapy, which requires a doctor’s prescription and careful monitoring. Men with normal testosterone levels should not consider testosterone therapy.

Testosterone levels affect everything in men from the reproductive system and sexuality to muscle mass and bone density. It also plays a role in certain behaviors.


The hypothalamus is the decision-maker. It puts in a request for how much testosterone should be produced. Read more.

Located above the kidneys, the adrenal glands make hormones, including a small amount of testosterone. Read more.

Sperm production is a never-ending job that requires a steady supply of testosterone. Read more.

Throughout a man’s life, testosterone affects his level of sexual desire. Is there truth to the “use it or lose it” theory? Read more.

The brain is the control center for testosterone production, housing the hypothalamus and pituitary glands. Read more.

Some of the side effects of testosterone replacement therapy include skin irritation and acne. Read more.

Testosterone helps a man’s body burn fat more effectively. Read more.

Testosterone may play a role in heart health, but studies of testosterone therapy and heart health are ongoing. Read more.

The pituitary gland takes orders from the hypothalamus and passes instructions to the testicles. Read more.

Testosterone is produced mainly in the testicles. Testosterone therapy can cause testicles to become softer and smaller. Read more.

Testosterone surges during adolescence to help the testicles and penis mature. Read more.

Your competitive spirit just may be influenced by the amount of testosterone in your body. Read more.

Losing body hair? Maybe your testosterone levels are dropping. Read more.

Testosterone helps increase muscle mass. It also helps make exercise more efficient. Read more.

Low testosterone can result in loss of bone density, increasing risk of fracture. Read more.

A blood test can tell you if your testosterone levels fall within the normal range. Read more.

It All
Starts Here
Another Hormone Maker
Sperm Production
Control Center
Skin Issues
Fat Metabolism
Heart Health
The Messenger
Main Source
Genital Transformation
Behavioral Traits
Beard and Body Hair
Muscle Mass
Bone Density
In the Bloodstream