But I'm not more aggressive—a behavior change often tied to testosterone. That's not surprising to Robert Sapolsky, ., a neuroendocrinologist at Stanford University and a leading researcher on stress and behavior. "It's really not the case that testosterone 'causes' aggressive behavior," he says. "Instead, it makes the brain more sensitive to social cues that trigger aggression. And in support of that, a guy's testosterone level isn't a very good predictor of how likely he is to be aggressive."
After review of the results of the initial blood tests, if the doctor decides that it’s safe and appropriate to start testosterone replacement therapy, a prescription for one month’s testosterone replacement therapy will be authorised. A further blood test will be needed after three weeks to see how you are responding to treatment. All being well, a further five months of treatment will be authorised before another blood test is needed to check your testosterone levels , a year after treatment is initiated, and each year after that, further blood tests will then be needed to ensure that the ideal level of testosterone in your body is maintained and that your continued use of testosterone replacement therapy remains safe. We will be checking for indications of prostate or blood problems that can occur.