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Table 3 Potential ergogenic nutrients contained in energy drinks that may affect cognition and/or mental performance

From: International Society of Sports Nutrition position stand: energy drinks

Ingredient Potential ergogenic value Scientific support
Taurine Improved mental focus, concentration, serve as antioxidant, glucose homeostasis [2124] Some supportive evidence with ED and fed animals [2535]
Gingko Biloba Improve memory and mental concentration Some supportive evidence on memory (e.g., 120 mg/d) [3639]. No known effects at dosages found in ED or ES.
L-Tyrosine Prevents depletion of catecholamines, may ameliorate declines in cognition with acute stress [4047] Some supportive evidence on cognition (e.g., 2 g/d, 150 mg acute ingestion with cold exposure) [41, 43, 46, 48, 49]. No effects on performance capacity [42, 50]. No known effects at dosages found in ED or ES.
Citicoline Intermediate in the generation of phosphatidylcholine from choline. Increase dopamine receptor densities and delay memory impairment [51, 52]. Some supportive evidence with large doses (8.5 g prior to and during exercise) and in fed animals [52]. No known effects at dosages found in ED or ES.
5-Hydroxy-L-Trypotophan (5-HTP) Precursor to serotonin [53, 54]. Purported antidepressant, appetite suppressant, & sleep aid [53, 5558]. Some evidence in treatment of depression [53, 5558]and 5-HT fed animals on muscle performance [54, 59, 60]. Role on exercise performance at dosages found in ED and ES is unknown.
St. John’s Wort Anti-depressant [5658]. Some supportive evidence [5658]. No known effects at dosages found in ED or ES.