A regular 12-ounce can of Coke has about 34 milligrams of caffeine, whereas a 12-ounce coffee has around 95 milligrams of caffeine on average.

Coke's caffeine levels are more similar to green tea, and unlike coffee which uses natural sources, some soda producers swapped caffeinated kola nuts for synthetic alternatives.

A can of Pepsi has a little more caffeine than Coke, and Dr. Pepper has even more. For the most energy, grab a cold brew or an espresso which has about 63 milligrams of caffeine.