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Take a cue from the front lines. This turbo-caffeinated gum (each piece has 100 milligrams of caffeine, 20 milligrams more than your typical cup of coffee) was developed by the Army to instantly improve alertness among soldiers (it's even part of their rations!). Clinical studies have shown it also boosts cognitive abilities and physical performance.Stay Alert gum in Spearmint, $29/pack of 24; stayalertgum.com.
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