A study from the University of Chicago found that when healthy young men slept only about five hours a night, their daytime ...

For many guys, having low energy isn’t simply a result of a rough night of sleep or a demanding workweek—it might be low testosterone levels at play. Testosterone is an androgen (or male hormone) that ...

As winter sets in, many people start believing that colder weather naturally boosts testosterone levels. You might hear claims that the body performs better hormonally in the cold, or that winter ...

Total testosterone measures the full amount of the hormone in your blood, while free testosterone represents the small, ...

What used to be a niche treatment for men with legitimate medical conditions has morphed into "youth and vigor" as a subscription. But there's a dark side.