Depending on the type of tea, an 8-ounce serving of Luzianne has anywhere from no caffeine to 71 milligrams of caffeine. Luzianne's Pour-n-Stir iced tea is completely caffeine-free, but the decaf tea bags still have low levels of caffeine, which is between 4 and 6.8 mg per serving depending on the flavor.
Regular iced tea bags have 22 to 33 milligrams of caffeine per serving. One tea bag makes four servings of tea, so it actually contains even more caffeine. A pre-made, single serve cup of Luzianne tea could have anywhere from 29 to 71 milligrams of caffeine. Other brands have similar caffeine levels. According to the Mayo Clinic, adults should consume less than 500 milligrams of caffeine per day.