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Why You Should Know How Much Caffeine Is in Everything

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Most of us go through life with only a vague idea of how much caffeine is in what we eat and drink. That coffee should wake us up; this soda is probably caffeine-free. But if you want to use caffeine effectively, you really need to know the amount in your favorite sources. You can’t properly time your caffeine…

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Source: LifeHacker.com