Testosterone is naturally found in the human body. It is produced in the testes (in males) and the ovaries (in females) of all animals--and nowhere else in nature. While it is possible to obtain testosterone from a living creature, synthetic production is clearly preferable. According to Dr. Randy Treadway, the natural abundance of testosterone is not known.

Since the 1940s, testosterone has become very heavily abused by athletes seeking a competitive edge over their opponents, since it promotes muscle growth. However, when used in amounts that result in respectable muscle growth, there are many negative side-effects.

There have been a number of studies to show the medical advantages to the use of testosterone in controlled amounts. Recent reports have indicated that the use of small doses of testosterone in aging men has resulted in higher self esteem, better physical condition, and more stamina among the test subjects.

Testosterone is a truly important compound--it has the potential to affect the human body in a number of powerful ways.