The caffeine content of a brewed beverage like black tea can fluctuate based on several factors, including the specific tea variety, leaf size (whole leaf, broken leaf, fannings, dust), water temperature, and steeping time. Generally, black tea contains a moderate amount of this naturally occurring stimulant. For instance, an eight-ounce serving of Lipton black tea typically provides between 30 and 80 milligrams of caffeine.
This stimulant has demonstrable effects on the human body, primarily influencing the central nervous system. It can increase alertness, reduce feelings of fatigue, and improve cognitive performance. Historically, tea has been consumed for its invigorating properties across various cultures. Understanding the caffeine content in a specific tea brand allows consumers to make informed decisions about their beverage choices, particularly regarding potential impacts on sleep patterns or sensitivity to stimulants.