topicTheanine Cognitive Performance Randomized Trial
claimEvidence regarding the acute effects of caffeine (CAF), L-theanine (TEA), and their combination remains inconsistent, particularly with respect to their combined influence on physical and cognitive performance in athletic populations.
evidence level2
citationTuncer SY (2026)
sourceAcute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study.
topicTheanine Cognitive Performance Randomized Trial
claimResults Condition effects were found for leg strength ( p = 0.004, ηp 2 = 0.24) and back strength ( p = 0.008, ηp 2 = 0.19).
evidence level2
citationTuncer SY (2026)
sourceAcute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study.
topicTheanine Cognitive Performance Randomized Trial
claimAdditionally, no significant difference was found between the conditions in aerobic endurance, maximum isometric handgrip strength, and hand-eye coordination results.
evidence level2
citationTuncer SY (2026)
sourceAcute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study.
topicTheanine Cognitive Performance Randomized Trial
claimIntroduction Modern athletic performance is driven not only by physical capacity but also by rapid decision-making, attentional control, and visuomotor coordination.
evidence level2
citationTuncer SY (2026)
sourceAcute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study.
topicTheanine Cognitive Performance Randomized Trial
claimFailure to meet the recommended 7-9 hours of restful sleep per night is known to increase the risk of several health conditions, reason why regular and adequate sleep should be seen as a priority instead of an unnecessary commodity easily traded as required by the commitments of our busy lives.
evidence level4
citationConti F (2026)
sourceDietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.
topicTheanine Cognitive Performance Randomized Trial
claimWhile both the quantity and the quality of sleep can be largely improved with relatively straightforward practices dictated by good sleep hygiene, emerging research suggests that dietary and supplementation protocols focused on certain foods, nutrients, and biochemical compounds with sleep-promoting properties can act as subsidiary sleep aids in complementing these behavioral changes.
evidence level4
citationConti F (2026)
sourceDietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.
topicTheanine Cognitive Performance Randomized Trial
claimThe scope of this narrative review is to summarize the available evidence on the potential benefits of selected nutraceuticals in the context of circadian rhythm and sleep disturbances, namely melatonin, magnesium, omega-3 fatty acids, tart cherry juice, kiwifruit, apigenin, valerian root, L-theanine, glycine, ashwagandha, myoinositol, Rhodiola rosea, and phosphatidylserine.
evidence level4
citationConti F (2026)
sourceDietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.
topicTheanine Cognitive Performance Randomized Trial
claimHumans spend approximately one third of their life asleep but, as counterintuitive as it may sound, sleep is far from being a quiet state of inactivity.
evidence level4
citationConti F (2026)
sourceDietary Protocols to Promote and Improve Restful Sleep: A Narrative Review.