testosterone

There's a lesson about one of the testosterone studies released this week that has nothing to do with testosterone: The study on how testosterone affects anemia was designed with an ethical lapse that nobody noticed until the study was complete.

Many men over 65 with low testosterone levels say their sense of well-being, not to mention sexual function, isn't what it used to be.

That's why some doctors prescribe testosterone replacement. But the effectiveness of testosterone has been controversial. Studies of the risks and benefits have been mixed, and the Food and Drug Administration beefed up its warnings about cardiac side effects of testosterone supplementation in 2015.

As men age, they lose testosterone — which some say affects their sense of well-being and sexual function. But for healthy older men, using supplemental testosterone as a remedy has been controversial. Past studies of the supplement's use have been relatively small, and the evidence about benefits and risks has been mixed.