(HealthDay News) -- The U.S. Food and Drug Administration warns against taking pure or highly concentrated caffeine products, citing at least two overdose deaths among otherwise healthy people.
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Given possible difficulty in measuring the products in a safe dose, and the products' resemblence to other beverages, it's relatively easy to overdose, the agency says.
One teaspoon of pure powdered caffeine may contain as much of the stimulant as 28 cups of coffee, the FDA warns.
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