The caffeine content of Irish breakfast tea, a robust blend of black teas typically from Assam, Ceylon, and Kenya, ranges from 30 to 90 milligrams per cup (8 ounces). Several factors influence the final caffeine level, including the specific tea blend, brewing time, water temperature, and leaf quantity.
Understanding the stimulating effects of this popular beverage provides valuable context for consumption choices. Moderate caffeine intake can enhance alertness, improve mood, and potentially contribute to improved cognitive function. This knowledge is particularly relevant for individuals sensitive to caffeine or those managing their intake for health reasons. Historically, the invigorating properties of tea played a significant role in its adoption as a staple beverage in various cultures, including Ireland, where a strong cup of tea remains deeply ingrained in daily life.