Fein Energy Crystals

Caffeine Level
Serving Size
fl. oz packet
Caffeine Strength
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Fein energy crystals can be added to any favorite beverage, even water, to make it an energy drink without altering the flavor. Fein's formula is all-natural caffeine citrate and a suite of secret, 100-percent natural "taste erasers."

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Ingredients in Fein Energy Crystals

Sugar content: Contains no sugar.

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Caffeine Comparisons

Fein Energy Crystals contains 9.38 mgs of caffeine per fluid ounce (31.70mg/100 ml).

Caffeine (mg) per Ounce
10090807060 5040302010 0 Fein Energy Crystals 5 Hour Energy Espresso Shot Coca-Cola Classic Spike Energy Drink
Total Caffeine (mg)
400360320280 24020016012080 400 Packet of Fein Energy Crystals Can of Coca-Cola Classic Bottle of Redline Energy Drink Can of Monster Energy Drink Can of Red Bull