Those risks were seen in veterans with low testosterone levels and other health problems. They were in their 60s on average.
The authors and other doctors say the results aren't conclusive, but do raise concerns about widely used and heavily marketed testosterone gels, patches and injections.
Men in the study who used the products were about 30 percent more likely than nonusers to have one of the bad outcomes.
The results were published Tuesday in the Journal of the American Medical Association.
More Nation & World Headlines
Pope Francis urges Congress to embrace migrants Obama, Putin to meet next week at the UN Saudi Arabia: Stampede at hajj kills 717 pilgrims Blacks do better than whites when both get same health care Court says Batmobile entitled to copyright protection Pope Francis outlines his issues Americans see Hillary Clinton, Jeb Bush as presidential Ghost hunters found dead after police standoff
Our new comment system is not supported in IE 7. Please upgrade your browser here.