Fact checked by Nick Blackmer Caffeine stays in your system for up to 10 hours, with peak levels between 15 minutes and two ...

Tea and coffee contain caffeine, antioxidants, and other beneficial nutrients. Both beverages offer potential health benefits ...

Some foods can give you an instant caffeine boost, all without the dreaded crash afterward.

Add Yahoo as a preferred source to see more of our stories on Google. What a new study says about caffeine. (Getty Creative) (pixelfit via Getty Images) You may wake up in the morning desperate for a ...

Too much coffee can be a latte for the heart to handle, with a new study linking over 400 milligrams of caffeine a day — roughly a venti-size coffee at Starbucks — to an increased risk of ...

Taking oral caffeine supplements may significantly reduce fatigue and improve quality of life and mood in people with MS, trial results show.

Enjoying decaf coffee could be good for your health—it could help protect against type 2 diabetes, liver disease, and heart ...

Tea is unlikely to dehydrate you when consumed in moderation. However, drinking more than 8 cups at once can have a ...

A genetic study reveals that it is not coffee itself, but how long caffeine remains in the blood, that influences the risk of diabetes.