Coke and diet coke contain caffeine, which can be problematic for those looking to cut down. To understand how much caffeine is in coke and diet coke, you need to know the size of the can or bottle.

Diet Pepsi actually contains less caffeine than Diet Coke, with a 12-ounce can of the former containing 35 milligrams of caffeine. A 12-ounce can of Diet Mountain Dew, on the other hand, contains ...

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Another major difference between Diet Coke and Coke Zero, Sharp points out, is caffeine content. A 12-ounce can of Diet Coke has about 46 milligrams, while Coke Zero has 34 milligrams.

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Experts fear there might be too much caffeine in one single can. Experts fear there might be too much caffeine in one single can. Skip to content. NOWCAST 40/29 News at 6:00.

Although a 12-oz can of Coke only has 34 to 46 mg of caffeine (about one-quarter the amount in a cup of coffee), the effects may still work in your favor, Dr. Datta says.

Diet Coke has more caffeine than regular Coke. This can seem strange, but there's an important reason for the added boost that you might not have noticed.