Testosterone is a powerful anabolic hormone that stimulates and controls the development of muscle, bone, skin, sex organs, and most other masculine, physical features. Recently, scientists have discovered that testosterone also aids mental function, enhancing both visual and perceptual skills.
Male testosterone is produced in the testes by a group of cells known as the Leydig cells. These cells begin secreting high doses of testosterone during puberty to trigger increased lean muscle mass, sex organ development, bone formation and higher energy levels. Testosterone levels peak during men's early to mid twenties.
As men ages, the amount of testosterone produced by the cells decreases. By the age of sixty, the average man will have lost nearly 50% of his testosterone supply. In addition, other factors such as stress, lack of sleep, physical inactivity, the use of prescription medication and drinking can cause testosterone levels to drastically decline.
Testosterone supplements are meant to enhance your performance and increase muscle gains. Testosterone supplements can increase male libido, strengthen bones, muscles, decrease body fat, improve thinking ability, boost energy levels and guard against the onset of depression and heart disease. Testosterone supplements are also used for bodybuilding by many men.