Nutrition

The most common sources of caffeine are coffee, tea leaves and coca beans. The caffeine content can range from as much as 160 milligrams in some energy drinks to as little as 4 milligrams in a 1-ounce serving of chocolate-flavored syrup. Caffeine is present in some over-the-counter pain relievers, cold medications, and diet pills.

The most common sources of caffeine are coffee, tea leaves and coca beans. The caffeine content can range from as much as 160 milligrams in some energy drinks to as little as 4 milligrams in a 1-ounce serving of chocolate-flavored syrup. Caffeine is present in some over-the-counter pain relievers, cold medications, and diet pills.