The caffeine content in a cup of tea can vary depending on several factors, including the type of tea, its origin, how it's processed, and how it's prepared. Here's a general guideline for the caffeine content in common types of tea:
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Black Tea: On average, an 8-ounce (240-milliliter) cup of black tea contains approximately 40-70 milligrams of caffeine. However, the caffeine content can range from 30 to 90 milligrams or more depending on the specific black tea variety and how it's brewed.
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Green Tea: An 8-ounce cup of green tea typically contains around 20-45 milligrams of caffeine. Again, the caffeine content can vary depending on the type of green tea and how it's prepared.
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White Tea: White tea generally has less caffeine than black or green tea. An 8-ounce cup of white tea contains roughly 15-30 milligrams of caffeine.
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Oolong Tea: Oolong tea falls somewhere between black and green tea in terms of caffeine content. An 8-ounce cup of oolong tea usually contains around 30-50 milligrams of caffeine.
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Herbal Tea: Herbal teas are typically caffeine-free or contain only trace amounts of caffeine. This is because herbal teas are often made from various herbs, fruits, flowers, and spices that do not naturally contain caffeine. However, some herbal teas may contain small amounts of caffeine if they include ingredients like yerba mate or guayusa.