If you have low testosterone you need not start therapy immediately unless you are symptomatic in the form of reduced sex drive. To a great extent low testosterone can be improved with weight reduction, diet and exercise. Further tablets or injections can be used to improve testosterone. It is very important to remain on checkup and periodic blood tests should be performed as advised by the andrologist. In case you want to start testosterone, you should be 100% sure that you do not want to make children. Testosterone therapy suppresses sperm production and it does not return to normal in all patients after stopping. In case you have to make children, other injections will be used.