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To assess the effect of Red Bull^© on (1) blood glucose and catecholamine levels, (2) cardiovascular and respiratory function changes before, during, and after exercise, (3) reaction time, (4) cognitive functions, and (5) response to mental stress test and emotions in young healthy individuals (N=38). Heart rate (HR) and arterial blood pressure (ABP), blood glucose, adrenaline, and noradrenalin plasma levels were measured before and after Red Bull^© intake. Participants were subjected to 4 different study protocols by randomized order, before and 30 minutes after consumption of 500 mL of Red Bull^©. Mean ABP and HR were significantly increased at rest after Red Bull^© intake. Blood glucose level and plasma catecholamine levels significantly increased after Red Bull^© consumption. Heart rate, respiration rate, and respiratory flow rate were significantly increased during exercise after …