I was wondering does the ginseng that most popular energy drinks contain have any adverse health effects?

Not really: ginseng in the amounts present in the energy drinks does not seem to cause problems, but a lot of the other stuff, like high dose caffeine does. The vitamins are worthless in most people and are just peed out mostly, and they DONT improve anybody's energy who isn't deficient in that vitamin. A lot of the other stuff, like taurine, is of uncertain safety.