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In this double-blind study, the effects of consuming a single can (250 ml) of Red Bull®, Sugar Free Red Bull®, or a flavor/appearance-matched placebo on attention and reaction time were measured using a computerized continuous performance task, administered 30 minutes after drink ingestion. No significant differences in continuous performance task performance were related to ingestion of any of the drinks. Effects of Red Bull® or Sugar Free Red Bull® on continuous performance task performance are, therefore, negligible, and are no greater than potential psychomotor enhancements
resulting from placebo expectancies.