For men with low testosterone, taking testosterone therapy doesn’t seem to raise their risk of heart problems, so doctors can prescribe it without worrying too much about the heart.

For men with low testosterone, taking testosterone therapy doesn't seem to make heart failure or heart-related death more likely—even though these men were already at high risk for heart problems.

For men with low testosterone who are at high risk for heart problems, taking testosterone therapy doesn’t seem to make heart attacks, strokes, or heart-related deaths more likely over about two years, according to a big study.

For men who have low testosterone, giving them testosterone therapy doesn’t seem to make prostate cancer more likely, so doctors can feel more confident using it when it’s properly needed.

For men who have both diabetes and low testosterone, taking testosterone therapy might lower their chance of having a heart attack by about 15% over about three years.

For men with low testosterone, taking testosterone medicine might slightly raise the chance of having an irregular heartbeat, but we’re not sure if that’s actually important for their health.