The study, presented at the European Association of Urology Congress, indicated that Supplementing testosterone significantly reduces heart attacks and strokes in men with unnaturally low levels of the hormone. The health of the men on testosterone therapy also improved by other measures.

"For those at high risk of heart attack and stroke, who are deficient in testosterone, it's likely that bringing the hormone back to normal levels helps them to maximise the benefits of other steps necessary to improve their overall health," the study said. While men need testosterone for certain psychological and biological functions, only those with low levels who display other symptoms are likely to benefit from testosterone therapy.

For the study, the team included over 800 men with testosterone deficiency, whose family history, blood pressure, cholesterol levels, diabetes or weight put them at high risk of heart attack or stroke. Only men with testosterone levels below normal, who also displayed symptoms of low testosterone, such as low mood, decreased appetite, depression, erectile dysfunction, loss of libido or weight gain, were included in the research.

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