A new joint study by the UCLA Fielding School of Public Health, the National Institutes of Health, and Consolidated Research Inc., has shown there is a twofold increase in the risk of a heart attack shortly after beginning testosterone therapy among men under 65 who have a history of heart disease. You may have seen one of the many advertisements geared toward men asking if they suffer from “low T” — low testosterone levels that, according to the ads, can result in lost sex drive, diminished energy, and moodiness. The answer, they suggest, may be as simple as applying testosterone through a gel or patch.