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Vitamins Information (Home) > Side Effects > Green Tea Green Tea Side EffectsGreen tea is generally free of side effects. The most common adverse effects reported from consuming large amounts (several cups per day) of green tea are insomnia, anxiety, and other symptoms caused by the caffeine content in the herb. An extract of green tea taken by healthy women with a meal inhibited the absorption of non-heme iron (e.g., the form of iron in plant foods) by 26%. Frequent use of green tea could, in theory, promote the development of iron deficiency in susceptible individuals. There are several case reports of people developing liver damage while consuming weight-loss products that contained concentrated extracts of green tea. A cause–effect relationship was not proven, and most of the products contained other ingredients in addition to green tea extract. Nevertheless, researchers have cautioned against the use of large amounts, or concentrated extracts, of green tea. Certain medicines may interact with green tea. Refer to drug interactions for a list of those medicines.
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