12 Surprising Sources of Caffeine
Riding the coattails of the fortified water trend is a new concoction from various bottling companies: caffeinated water. Some packaging, like that of the former Fruit2O Energy, which boasted as much caffeine as a cup of coffee, displays caffeine content prominently. But others, specifically those flavored with guarana, a Brazilian plant that is a natural source of caffeine, are less obvious; for example, Propel’s limited edition Invigorating flavor has 50 milligrams of caffeine, as does VitaminWater’s Energy flavor.
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