Barq's Root Beer has 22.5 milligrams of caffeine in each 12-ounce can. Diet Barq's doesn't have caffeine, and caffeine-free versions of other Barq's flavors are available in some markets, such as Utah.
The Barq's Root Beer served from Coca-Cola Freestyle dispensers is caffeine-free. It is always advisable to check the product labeling for the presence of caffeine.
Barq's product lines include Barq's, Diet Barq's, Barq's Red Creme Soda, Diet Barq's Red Creme Soda and Barq's French Vanilla Creme Soda. Barq Brothers Bottling Co. was founded in 1890, and Barq's Root Beer was introduced in 1898 with the simple slogan "Drink Barq's. It's good." The Coca-Cola Co. acquired Barq's in 1995.