It allows us to take a broad look at DNA variations and to assess your risk for certain ailments and what medications, at what dosages, might work best, based on your metabolism.

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Researchers studied dosages at 37.5, 75 and 150 milligrams a day.

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According to the researchers, 20 percent of those taking either high dosages or several of the drugs at once died in a two-year period, an alarmingly high fatality rate.

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Warren Zapol, of the Massachusetts General Hospital and a professor of anaesthesia at Harvard Medical School, along with his colleagues, monitored the vital signs of mice exposed to low-dosages (80 parts per million) of hydrogen sulphide for several hours.

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