In particular, the brand Barq's is notable for its caffeine content. The regular variety contains around 22 mg in each 12-ounce (355-ml) can. ... For reference, a typical 8-ounce (240-ml) cup of coffee contains approximately 96 mg of caffeine, which is about 4 times the amount in a can of Barq's ( 2 ).

Why does Barq's have caffeine?

Take a look at the Barq's original root beer label and you'll find caffeine. It's there between citric acid and artificial and natural flavors. That's right – the caffeine is added separately.

Is 22 mg of caffeine a lot?

Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks.