Possible Side Effects
In general, it is safe to consume oolong tea. Moderation is key. Keep in mind that this drink contains caffeine. If taken excessively, this stimulant might lead to some side effects, such as high blood pressure, irregular heartbeat, insomnia, headaches, and anxiety. The maximum recommended daily intake of caffeine is around 400 mg. Pregnant women should drink no more than 200 mg of caffeine per day. Also, consuming too many polyphenols might make them work as pro-oxidants, which can harm your health. Flavonoids in tea could even bind iron in plant foods, thus reducing absorption. That’s why people with low levels of iron should avoid oolong tea during meals. [8]