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A team of scientists from the University of Hawaii may have solved the mystery of why some Europeans who used products containing kava extract suffered severe liver damage, prompting a number of different nations to ban sales of the herbal supplement. The culprit may be a compound found in the stem peelings and leaves of the kava plant--known in Hawaii as "awa"--but which isn't found in the roots. It's the roots that are used to make the traditional kava drink consumed by Pacific Islanders.
Until now, experts were unable to explain how a plant used in island cultures for 2,000 years suddenly could become so toxic that it caused fatal liver damage in some cases.
When demand and prices for kava soared, European ...