Men over 65 who had their testosterone levels reset to those of much younger men didn't walk any faster. But they had more spring in their step, better erections, and a keener interest in sex than men who didn't get testosterone supplements. This set of trials, underwritten by the National Institute on Aging and several other national institutes, also found no increased risk of stroke or heart attack in those taking testosterone. At the same time, however, the study's authors acknowledged that these trials could not have detected anything short of a major jump in cardiovascular events. In a trial published Wednesday in the New England Journal of Medicine, researchers compared the mood,...
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