Fein is an all-natural neuro-active beverage crystal in single-serving “sticks” that can be added to water or any other favorite beverage 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.
Fein Energy
(800) 506-3346
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