Tea has been proven to release caffeine into your system more slowly than coffee. I tested the claim out of pure need when I was a college student trying to work on 2 hours of sleep a night and tea was the best. Coffee wore out too quickly and Cola (even stuff like Jolt) just put me to sleep after a few hours...not good when that time line leaves you asleep in Calculus class. Even drinking lots of water was better than Coke...especially in the mornings.