Any of the treatments will restore your testosterone to a normal or high level, but they have the side effect of reducing the amount of sperm your testicles produce which can result in infertility. The longer you are on the testosterone replacement the lower your sperm count will be, and prolonged treatment may result in permanent sterility. If you have not started or completed your childbearing it is important to discuss this issue with your provider before starting treatment. There are options such as freezing your sperm before starting testosterone replacement that will enable you to have healthy sperm for fertility options later. You may also consider using medications that stimulate your testicles to produce more testosterone, such as Clomid, which do not have the side effects of lowering your sperm count.