red bull is the amatuer drink. If you want the real hard stuff try strength 5 coffee and those boots energy boost capsules..
Caffeine only makes you tired after your 3 to 4 hour boost of concentration and makes you urinate, it isn't good for you because its a stimulate, but its not bad. The only trouble is once you become an addict you have a heavy caffeine withdrawel, but its worth being stocked on caffeine and water for 3 weeks and then you quit after.
im suprised noone has been taking omega 3 fish oils and ginseng and ginkgo biloba. There are alot of supplements for the brain floating around you know?