Consumer Reports found that 8-oz energy drinks such as Monster (92 mg of caffeine) and Red Bull (83 mg of caffeine) are comparable in caffeine levels to a typical 8-oz cup of coffee (100 mg), but the drinks often come in much larger 24- or 32-oz cans. Of the 16 products tested that provided caffeine content on labels, five contained 20% more caffeine per serving than the amount stated on the label. The so-called caffeine wars—in which producers vied for the highest caffeine content—produced a product with 505 mg per 23.5-oz can, which has since been discontinued.14 The same line of energy drinks now includes a maximum of 344 mg per 16-oz can.



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