One teaspoon of pure caffeine powder delivers about the same jolt as 25 cups of coffee. The Center for Science in the Public Interest hide caption

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Potent Powdered Caffeine Raises Safety Worries

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Ten milligram tablets of the prescription drug Adderall. The drug is used to treat ADHD and is used by some students to boost their academic performance. Jb Reed/Bloomberg via Getty Images hide caption

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