Black tea does contain caffeine. An 8-ounce serving of black tea contains between 14 and 70 milligrams of caffeine. Decaffeinated black tea may contain up to 12 milligrams of caffeine per 8-ounce serving.
Coffee contains much more caffeine than black tea, having between 95 and 200 milligrams of caffeine per 8-ounce serving, while the same serving size of green tea contains between 24 and 45 milligrams of caffeine. Black tea may be consumed as either a hot or cold beverage. Black tea is made from the aged leaves of the Camellia sinesis plant. This kind of tea is used for enhanced mental alertness in addition to learning and memory. Black tea consumption is safe for the majority of adults.