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Safety Issues--Green Tea
As a widely consumed beverage, green tea is generally regarded as safe. It does contain caffeine, at perhaps a slightly lower level than black tea, and can therefore cause insomnia, nervousness, and the other well-known symptoms of excess caffeine intake.
Green tea extracts, however, may not be safe. There are a growing number of case reports in which use of a concentrated green tea extract was associated with liver inflammation.35,40,50 In most cases, liver problems disappeared after the extract was discontinued. But, in two cases, permanent liver failure ensued, requiring liver transplantation.36,40 While it is not absolutely certain that the green tea extract caused the liver problems, nor how it might do so, these reports do raise significant...
