Fein Energy Crystals
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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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Caffeine Concentration
Fein Energy Crystals contains 9.38 mgs of caffeine per fluid ounce (31.70mg/100 ml).
Caffeine (mg) per Ounce
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10 0 Fein Energy Crystals
5 Hour Energy
Coffee (Espresso)
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