Tricky Q. If you have a "normal" t level, then extra t won't improve your health. There are studies suggesting that higher t is associated w/less heart disease, less cancer, lower death rate, stronger bones, more muscle, less fat, stronger erections, greater sex drive, brighter mood, clearer thinking, etc, but these tend to be observational studies. Most recent one is http://bit.Ly/mhk22c.
Multiple benefits. In both men and women who have been diagnosed with "low-t, " many clinical studies have reported increased energy, sleep improvement, increased muscle mass, decreased body fat, improved concentration and memory, decreased hot flashes and night sweats, improved sense of well-being, and improved libido and performance. However, any hormone therapy should be prescribed and monitored by an hrt expert.