Testosterone gives men their deep voice, facial hair, a muscular build, increased RBC count and improved bone density. Unless you are suffering from erectile dysfunction though, getting into increasing testosterone levels isn’t advisable. It may help some men but isn’t for everyone. Several studies have reported side effects of testosterone therapy while there are newer contradictory reports to these possible side effects. The bottom-line is that long term side effects aren’t known. It’s best to consult your doctor about everything before you get it done.