First you need a blood test that will show if you are low in testosterone, the chart goes by your age, (and a male).then your Doc, will use injectable testosterone, the best is testosterone cypionate. the best results are injections every week, in the top of the glute, with a 23 guage needle , 1 inch long. after 1 month retest blood and adjust testosterone dose. When the correct level is reached , you can inject the testosterone your self at home, the nurse will show you correct way to inject. The problem with stroke and heart attacks is from the blood becoming to thick due to increased hemoglobin (the part of your blood that carries oxygen ,ask Lance Armstrong about that) this can be overcome by taking 1 tablet of aspirin a day, low dose 81 mg, the problem of prostate cancer. is addressed on your yearly check up with a psi marker test and exam, on you yearly check your Doc will do a blood test to check if your dose needs to be adjusted. This is the safest and best method of testosterone replacement therapy. I would tell people to have the correct diet, and sleep, and vitamins, and use the gym 3 times a week. The results will be huge. Remember 40% of men over 40 years have low t. DOC