Not many drugs are as widely used yet poorly understood as anesthetics. “We’ve used them for over a century, but nobody understands how they work,” says Alex Proekt, an anesthesiologist and ...

A gene known as ACTN3 (α-actinin-3) has earned the nickname “the gene for speed,” and it may have an influence on how androgens work through the androgen receptor to maintain muscle mass. Research has ...

The treatment has become increasingly popular, especially among older men. Here is what to keep in mind if you are considering it. By David Dodge Testosterone therapy has exploded in recent years.