Differential cognitive effects of energy drink ingredients: Caffeine, taurine, and glucose

► Energy drinks may improve memory and psychomotor performance and reduce fatigue. ► Whether energy drinks effects are due to caffeine or other ingredients is unknown. ► We assessed effects of energy drink ingredients: caffeine, taurine, and glucose. ► Caffeine reduced fatigue and improved attention, working memory, reaction time. ► Caffeine content, not taurine or glucose, drives cognitive performance improvements.