Paraxanthine is the main metabolite of caffeine. Studies suggest it can boost alertness and focus, but the research base is ...

Very high doses of caffeine and acetaminophen (such as Tylenol), taken together, could lead to liver damage, researchers warn. This combo produces a byproduct enzyme that's toxic to the organ, ...

On their own, the foods are safe, but combined, certain foods can become incredibly dangerous and toxic. These are foods you should never mix.

A staggering 94% of Americans use caffeine, 64% of whom do so on a daily basis. It’s the energy enhancer people start their ...

Mixing caffeine and alcohol may make you feel more alert, but it doesn't make you less intoxicated. Here's what to know.

Dr. Portenoy answers the question: 'Over-The-Counter Pain Killers, Caffeine?' — -- Question: Why Do Some Over-The-Counter Pain Killers Contain Caffeine, And Is That A Good Thing? Answer: Another ...

Some claim it gives you energy and focus—without the jitters and crash.