Testosterone therapy promises to help men recapture their vitality, decrease body fat, and enhance libido. While hormone treatment can be medically necessary for some men, it is not meant to be a fountain of youth if your levels fall within the normal range. Most doctors have varying opinions on testosterone therapy and agree that more research is needed. If you think you may have low levels of testosterone, make an appointment with your doctor. A simple blood test can determine if you need testosterone therapy or have any underlying conditions.