An 8.4-ounce serving of Red Bull, for instance, has a relatively modest 76 to 80 mg of caffeine, compared to the 95 to 200 mg in a typical cup of coffee, the Mayo Clinic reports. What many energy drink brands frequently do have, though, is tons of sugar and hard-to-pronounce ingredients (check out our video report on the subject here). And for more on how much caffeine is in tea, soft drinks and other products, click here. Dark roast coffees actually have less caffeine than ...