The compounds have exploded in popularity, but big questions about safety and effectiveness are still unresolved.

Learn how caffeine affects brain chemicals and health, sleep, and mood. Understand safe daily limits, hidden sources, and signs you’re getting too much.

Tourette’s syndrome, a neurological condition that causes involuntary sounds or movements known as tics, has come under the spotlight after a man with the condition shouted a racial slur during the ...

Oolong tea may help boost metabolism, support fat oxidation, and offer additional benefits for blood sugar. Learn the best way to drink oolong tea.

Catherine O’Hara’s death from a pulmonary embolism has drawn attention to this serious condition in which a blood clot lodges in the lungs. Dr. Leana Wen explains.

Curiosity fuels learning, creativity, and connection. So why does it disappear when you need it most? These micro-moves offer a surprisingly practical way to bring it back.