This gum is great for staying awake while driving or sitting somewhere where you need to stay awake. I've heard alot of other caffeine gums don't work, but this one has worked for me. I only have used 1 peice at a time too which is only 50 mg of caffeine but still proved to be decently effective. I do want to mention that I don't consume caffeine everyday so I still remain sensitive to it. For those more insensitive to caffeine they may need to use 2 peices for effect. The other thing that I really love about this gum is that it keeps its flavor alot longer than most gums and it doesn't leave your breath smelling disgusting like most other gums after an hour of use. I believe this is due to the ingredients they use, and the lack of toxic ingredients in which normal gum companies use. Best gum I've ever used. I really don't like using gum in general, but I needed something to keep me awake for my job and this is the hack.