The Ingredient That Adds A Punch Of Caffeine To Dunkin' Energy Drinks - Tasting Table
Briefly

"Guarana seeds are a natural, concentrated caffeine source providing the ultimate energized kick. With four times the caffeine of actual coffee beans, it's popular in energy drinks."
"Though the exact amount of guarana used remains a mystery, Dunkin' Energy's ingredients show guarana seed listed after a note saying 'contains 2% or less.'"
Read at Tasting Table
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