Green tea is safe for
most adults when used in moderate amounts. But :
1). There have been some
case reports of liver problems in people taking concentrated green tea
extracts. The problems do not seem to be connected with green tea infusions or
beverages. Although these cases are very rare and the evidence is not
definitive, experts suggest that concentrated green tea extracts be taken with
food, and that people discontinue use and consult a health care practitioner if
they have a liver disorder or develop symptoms of liver trouble, such as
abdominal pain, dark urine, or jaundice.
2). Green tea and green
tea extracts contain caffeine. Caffeine can cause insomnia, anxiety,
irritability, upset stomach, nausea, diarrhea, or frequent urination in
some people.
3). Green tea contains
small amounts of vitamin K, which can make anticoagulant drugs, such as
warfarin, less effective.
courtesy : http://nccam.nih.gov/health/greentea
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