Talk to your doctor to find out if any medicines you are taking may have this effect. Some medicines can also cause caffeine to stay in your body longer than usual. Some of the problems it can cause include:īlack tea or black tea supplements may interfere with other medicines and supplements you are taking. Side effects of black tea (most often in high amounts) may include:Ĭombining black tea with other types of caffeine or a product called ephedra can be very dangerous. That's mostly because of caffeine-related side effects. This makes it hard to set a standard dose.ĭrinking large amounts of black tea - more than four or five cups a day - may cause health problems. Supplement ingredients and quality may vary widely. More research is needed, but there’s some evidence drinking black tea regularly may lower your risk for these conditions:ĭrinking black tea in moderate amounts is generally safe for most people. Antioxidants, including polyphenols and catechins.Many people drink black tea just because they like it.
Sometimes, the supplement includes other types of herbs, vitamins, or minerals. Green tea comes from the same plant, but is not oxidized.īlack tea extract is sometimes sold as an herbal supplement. Tea manufacturers can control the amount of oxidation. Oxidation means the leaves are exposed to moist, oxygen-rich air. It should always be steeped in hot water before it is cooled.Ī process called oxidation turns the leaves from green to a dark brownish-black color. It has caffeine as well as other stimulants and antioxidants. Black tea is made from the leaves of a bush called Camellia sinensis.
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