One, the development of secondary male sex characteristics also called the androgenic functions of testosterone. Some examples of these characteristics are increased growth of body hair, beard growth, deep voice, and increased production of sebaceous glands, development of the penis, aggressiveness, sexual behavior, libido, and the maturation of sperm. Two, the promotion of the protein biosynthesis that is responsible for the highly anabolic characteristics of testosterone. This is an important function because it accelerates muscle buildup, increases the formation of red blood cells, speeds up regeneration, and speeds up recovery time after injuries or illness. It also stimulates the entire metabolism which results in the burning of body fat. And three, it can inhibit the gonad regulating cycle, which regulates the amount of testosterone produced in the body. If your testosterone level in the blood is too high, your body will tell itself to reduce or even stop production of it until it is back down to its normal levels.

During puberty, testosterone levels are at their lifetime peak. They begin to decline around the early 20’s for men. This is where testosterone therapy comes into play. Many men and women suffer from the lack of important hormones and replacement therapy is simply the most effective way to combat the signs of aging. Sex hormones like estrogen and progesterone profoundly affect the brain. The increasing memory loss and mild mental confusion emerging in middle age are largely due to declining levels of estrogen and progesterone in women. In men, these same problems are caused by decreasing testosterone and increasing estrogen levels beginning in the late thirties or early forties