Testosterone. Even the word alone sounds manly. For men, testosterone is important for drive, fertility, heart health, bone health, energy and mood — to name just a few benefits. When you have low ...

Matt Kaeberlein, a longevity researcher and CEO of Optispan, had symptoms of low testosterone. He got his levels tested in his 50s and gradually began testosterone replacement therapy (TRT). He said ...

Learn how sleep affects testosterone, what the research shows, how much sleep lifters need, and when low testosterone ...

Dear T.B.: Although I am never fond of insurance companies making medical decisions, this does make sense from physiology. Cholesterol is made in the body, mostly in the liver and mostly at night ...

While TRT is only U.S. Food and Drug Administration (FDA)approved for men with clinically low testosterone levels, marketing has expanded TRT’s reach to those seeking enhanced vitality, from increased ...