Energy crystal drink additive

Updated Apr 22, 2013

Fein01finalFein is an all-natural neuro-active beverage crystal in single-serving “sticks” that can be added to water or any other liquid without changing the flavor. Fein provides 75 mg caffeine, a similar amount to many 8.3-oz. energy drinks, the company says. Fein has no calories, carbohydrates or sugars.

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