neuro science at johns hopki hopkins. >> i see energy drinks as another delivery nor caffeine, caffeine is the most widely used mood altering drug in the world. all of these drinks contain at tides like toreine, and b vitamin and a host of claims made that the additional ingredients somehow interact and produce a different effect. that remains to be shown scientifically. the big new difference is that the energy drinks are being marketed for performance enhancement to increase concentration and they're being targeted toward what i see as kind of a vulnerable population. there's a lot of down side cultural risk to promoting drug use in that form. so, in that sense, it's a new marketing message and perhaps may be-- have some embedded dangers in it. >> now, we reached out to all