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What's the caffeine content in your favorite energy drink, tea, or soda?

Everyone knows you can find plenty of caffeine in regular coffee (80-150 milligrams in a 6-ounce cup of brewed coffee). But you might be surprised to find as much (or more) caffeine in energy drinks, sodas -- even gum and ice cream.

Coffee-flavored frozen yogurt and ice cream is also suspect, with anywhere from 45 to 85 milligrams of caffeine per cup, depending on the brand. Even some medications have caffeine: 56-120 milligrams for a standard dose of over-the-counter pain relievers, and up to 200 milligrams in weight control aids like Dexatrim.

But when I headed to the supermarket to look for products with surprisingly high caffeine content, the real shock to me was that so many energy and coffee drinks don't clearly list their caffeine content on their packaging. Some had it listed on the can, but you almost needed a magnifying glass to find it. Others, like Starbucks Double Shot products, didn't seem to have the information on their packaging at all.

"The caffeine content of energy drinks varies over a tenfold range, with some containing the equivalent of 14 cans of Coca-Cola, yet the caffeine amounts are often unlabeled and few include warnings about the potential health risks of caffeine intoxication," says Roland Griffiths, PhD, a professor of behavioral biology at Johns Hopkins University.

Given what some companies are claiming about caffeine, you might think it's super healthy. The company that makes Red Bull, for example, asserts that the caffeine in the energy drink acts with other key ingredients to deliver benefits like increased endurance, increased concentration, and improved reaction speed, as well as a stimulated metabolism.

But you'll also find warnings on several of these caffeine-laden drinks. Spike Shooter cans bear this message: "Do not use if you are under the age of 16 or elderly." And the label of Monster Energy drinks specifies "Limit 3 cans per day -- Not recommended for children, pregnant women or people sensitive to caffeine."

While scientists are continuing to discover all the health benefits and detriments of caffeine, the American Psychiatric Association (APA) recognizes caffeine intoxication as a clinical syndrome.

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