Study: Energy drinks could be hazardous

Researchers have found some of these drinks contain potentially harmful levels of caffeine. Some have the equivalent of 14 cans of Coca-Cola.

Energy drinks are not required to list the amount of caffeine, because they are sold as supplements, not as soft drinks.

An organization that represents energy drinks disputes researchers' claims.

The study is in this month's journal Drug and Alcohol Dependence.

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