This article seems pretty imbalanced. Modifying your natural endocrine levels (and the decline of testosterone with age in men is natural) can have significant

This article seems pretty imbalanced. Modifying your natural endocrine levels (and the decline of testosterone with age in men is natural) can have significant unanticipated long-term effects (witness the problem with estrogen replacement therapy in women). A quick Google Scholar search pops up paper with titles like "Serum testosterone is associated with aggressive prostate cancer in older men", "Increased heart attacks in men using testosterone: the UK importantly lags far behind the US in prescribing testosterone", "High Estrogen in Men After Injectable Testosterone Therapy" and "A review on the relationship between testosterone and life-course persistent antisocial behavior". There is clearly medical literature that contradicts the rosy view indicated by the article's sources. I would have liked to see the article discuss those issues and the associated studies.