— The average amount by which five energy drink makers under-reported caffeine content in their products.

The discrepancy was revealed in a Consumer Reports test in which 27 best-selling energy drinks were analyzed and found to contain 6 milligrams to 242 milligrams per serving of caffeine. Of the 27 brands, 11 do not list caffeine content and among the 16 that do, the tested amount exceeded the amount listed on the beverage. Energy drink makers are not required to list the caffeine content of their products. Consumer Reports

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