I've tried it. A very knowledgable friend who owns an Herb Shop (where they sell Nature's Sunshine Herbs) told my daughter when she brought some in a bottle to seminary one morning (this person also teaches seminary at 6:30 am every school day to LDS kids) that it is to be used sparingly....just not over used. I had been carrying around liter bottles of it : ) (I backed off at that point). It was better than the energy drinks my daughter had been using! : ) I am personally, though, very sensitive to caffiene...even in chocolate. (That is the only kind of I even have) but it didn't seem to bother me and did help me function better. Worth a try if not overused. All you can really do is see how it affects you personally.