Barq's Root Beer is one of the few types of root beer that contains caffeine. However, the company does offer a caffeine-free variety for consumers to purchase.
According to the Center for Science in the Public Interest, Barq's Root Beer has approximately 23 mg of caffeine per 12-ounce serving. The official Food and Drug Administration (FDA) limit for caffeine in soft drinks is 71 mg of caffeine per 12-ounce serving, making Barq's well below the limit. In comparison, a cup of strongly brewed coffee typically has between 75 and 100 mg of caffeine per serving, which is far more than Barq's.