Selling the Jitters: “The market for energy drinks loaded with caffeine and other additives has exploded, leaving researchers worried about the potential health effects of the potent beverages.” Spectator. On the other hand: FDA Issues Warning on Kava-Containing Supplements:

“Following in the footsteps of Australia, Canada and several European nations, the US Food and Drug Administration (news – web sites) (FDA) warned American consumers on Monday against the use of products containing kava, a herbal ingredient most often promoted for relaxation and the alleviation of sleeplessness.

The FDA said it was issuing the warning because kava has been associated with liver-related injuries in the US and several other countries, including Germany, Switzerland, France, Canada and the United Kingdom.” Yahoo! News [thanks, Nancy!]