The user generally experiences an increase in muscle mass and strength very quickly. They experience heightened ability to lift heavier weights and train for more often and for longer periods of time because of their improved recovery rate. [591-592] In addition to this, testosterone use can improve mood, cognition, blood sugar levels, bone mineral density, sexual function and well-being. Large retrospective or prospective studies failed to demonstrate any serious side effects related to testosterone use. 
Testosterone does not cause Prostate Cancer
Recently, there has been a paradigm shift whereby testosterone replacement therapy administration in prostate cancer patients has increased. Many longitudinal studies focusing on the relationship of blood testosterone levels and subsequent risk of prostate cancer failed to find any association. 
In a large meta-analysis of 18 prospective studies involving 3886 men, there was no association between the risk of prostate cancer development and serum concentrations of testosterone.  In another study, Morgentaler et al. proposed a saturation theory which explains why testosterone does not directly cause prostate cancer. According to his model, normal prostate cells and even cancer cells seem to have a saturation point and are not affected as testosterone levels increase. 
In the latest meta-analysis presented in the American Urological Association 2015 Annual Meeting, Dr. Peter Boyle reported that testosterone, whether occurring naturally or taken as replacement therapy, does not cause prostate cancer or stimulate increases in the levels of prostate-specific antigen (PSA) in men. 
Testosterone and Cardiac Disease
Cardiovascular diseases are associated with insufficient level of the sex hormone testosterone.  In the largest study to date, Khaw et al. investigated the effects of testosterone levels and mortality among 11 606 healthy men aged 40 to 79 years old over a 6 to 10-year follow-up period and observed a significant association between low levels of testosterone and increased risk of cardiovascular diseases. 
In the most recent study, Dr. Barua, an assistant professor of medicine at the University of Kansas School of Medicine, and his colleagues reported that testosterone supplementation can reduce the risk of myocardial infarction (MI), stroke, and all-cause mortality at normal levels.  In hopes of providing some answers to testosterone and cardiac disease association, the study team retrospectively examined national data on 83,010 men (aged 50 and above) with documented low testosterone levels who received care from the Veteran’s Administration between 1999 and 2014. The results of the study showed that treated men with testosterone levels at normal range were 56% less likely to die during the follow-up period, 24% less likely to suffer a myocardial infarction, and 36% less likely to have a stroke.
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