Coca-Cola Classic - 32/12 oz. cans  E-mail this product to a friend

Coca cola could be considered the earliest energy drink, although not marketed as such; it was one of the first carbonated drinks to contain caffeine. However, given that the formula has always remained secret this may simply be an embellishment. A 12 ounce can of Coca-Cola Classic contains 34.5 milligrams of caffeine.