Ginseng
What is it?: An extract made from the root of the ginseng plant. Panax ginseng is the species most commonly used. The ginseng content in energy drinks typically ranges between 8 mg and 400 mg in 16 ounces.
Does it work?: Not if you're hoping for energy to burn. A recent review in American Family Physician determined that ginseng doesn't enhance physical performance. But there is an upside: It may boost your brainpower. Scholey and his colleagues found that people who swallowed 200 mg of the extract an hour before taking a cognitive test scored significantly better than when they skipped the supplement. They also felt less mental fatigue.
Ginseng may work by increasing the uptake of blood glucose by cells in the brain and elsewhere, says Scholey. However, the right amount is essential—only two of the eight major energy drinks we examined contained that optimal dose of at least 200 mg.
Is it safe?: Since the amount of ginseng in an energy drink is minimal, harmful effects are unlikely. And while there have been some reports of negative side effects from ginseng—diarrhea, for example—Scholey points out that those occurred in people taking 3 g a day.
One caution: If you're on any medications, check with your doctor before knocking back an energy drink. Ginseng has been shown to interact with blood-thinning drugs like warfarin, potentially altering their effectiveness.
http://www.menshealth.com/mhlists/effectiveness_of_energy_drinks/Ginseng.php
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