Comparing the caffeine content of black tea and coffee isn't as simple as you might expect. Here's what you should know in ...

Green tea contains L-theanine, an amino acid that has a calming effect and can increase concentration at the same time. In ...

Green Tea Has Caffeine: What to Know Green tea contains caffeine, and the amount depends on the type of green tea. The average cup of green tea contains 3 calories and about 29 milligrams of caffeine.

Maternal tea consumption during pregnancy – particularly in the second and third trimesters – is associated with improved ...

The low to moderate (40–300mg) amount of caffeine typically contained in a cup of coffee has been found to improve alertness, attention and reaction time, but has less consistent effects on ...

Do you get the shakes after drinking coffee, or feel anxious after sipping a fizzy drink? Here’s how to know if you are hyper-sensitive to caffeine. While you may be jealous of those who can get ...