==Special Precautions of Green Tea==
* Pregnancy and breast-feeding: Best to avoid either green tea or ECGC extracts during pregnancy. Pregnant women who do either are at risk for the flip side of ECGC's anti-cancer properties, leading to carcinogenic dangers. And her newborn is at risk for childhood malignant central nervous system tumors if her polyphenol flavanoid intake is high. Caffeine : Consuming Consuming more than 200mg of caffeine has been linked to an increased risk of miscarriage and other negative effects. Caffeine passes into breast milk and can affect a nursing infant. Don’t drink an excessive amount of green tea if you are breast-feeding.
* Liver disease: Green tea extract (GTE) extract supplements have been linked to several cases of liver damage. Green tea extracts might make liver disease worse. (See also [[EGCG]])
* In some people, green tea can cause stomach upset and constipation.
* Too much green tea — more than five cups per day, for example — is POSSIBLY UNSAFE. It can cause side effects because of the caffeine. These side effects can range from mild to serious and include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion. Green tea seems to reduce the absorption of iron from food. Drinking very high doses of green tea can actually be fatal. The fatal dose of caffeine in green tea is estimated to be 10-14 grams (150-200 mg per kilogram). Serious toxicity can occur at lower doses.