Does Dunkin Donuts' Coffee Syrup Actually Contain Caffeine? - Tasting Table
Briefly

Dunkin's frozen coffee, akin to a sugary Slurpee, is made with coffee swirl syrup, which is a concentrate and provides significant caffeine despite lacking brewed coffee.
Though notable for its unique taste, Dunkin's frozen coffee allows for customization with flavor swirls or shots, combining taste preferences with different sweetness levels.
Read at Tasting Table
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