Testosterone is a sex hormone that regulates a number of processes in the human body, including fertility, sex drive, bone mass, fat distribution, muscle mass, and red blood cell production.

What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

This article was reviewed by Felix Gussone, MD. If you’ve been feeling a bit more couch potato than go-getter lately, dragging through the day, snapping at people for no reason, or wondering where ...

While the science isn’t yet clear, you could join the research that’s working to understand how nicotine affects testosterone levels. Nicotine is a highly habit-forming substance, one that can be in ...

Just because you’re young and look good doesn’t mean that your testosterone levels are where they need to be—quite the ...

That unexplained exhaustion or sudden change in your body might not be just stress or aging. Medical experts are seeing more men experiencing testosterone deficiency, often without realizing what’s ...

A viral Twitter post from April 9 claims testosterone levels have dropped by almost 50% over the past 20 years. "Here's a cheery Friday fact," reads the post. "An average 22 year-old (sic) male today ...

Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels. Testosterone ...