While doing some research I found that caffeine itself can enhance memory performance. This website I found explains all the good things of caffeine. Coffee is the most natural source of caffeine you can get, it is up to you whether or not you want to add milk and sugar.
There are billions of people everyday who buy coffee and energy drinks. I took a video of myself for the day to show how many students are buying coffee and how many different drinks there are. Honestly though, I just drink coffee for the flavor, never really wakes me up. I get energy from food most of the time and exercise of course.