Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study
Baba Y, Inagaki S, Nakagawa S, Kaneko T, Kobayashi M, Takihara T
Published in Journal of Medicinal Food
Methodology
Randomized, double-blind, placebo-controlled trial of a single dose and 12 weeks of L-theanine 100.6 mg/day in middle-aged and older adults, with cognitive testing.
Key Findings
A single dose of L-theanine improved reaction time and working memory on attention tasks, while 12-week administration produced improvement in verbal fluency mainly in participants with lower baseline scores.
Conclusions
L-theanine shows acute attention benefits and limited chronic cognitive effects in older adults.
Limitations
Manufacturer-funded; modest sample; chronic benefits limited to subgroup analyses.
Supplements Studied
A single dose of L-theanine improved reaction time and working memory on attention tasks.
Outcomes Measured
A single dose of L-theanine improved reaction time and working memory.
A single dose of L-theanine improved reaction time and working memory on attention tasks, while 12-week administration produced improvement in verbal fluency mainly in participants with lower baseline scores.
A single dose of L-theanine improved reaction time and working memory on attention tasks, while 12-week administration produced improvement in verbal fluency mainly in participants with lower baseline scores.
Related Health Concerns
Study Details
Access Study
Disclosures
Funding
Ito En Ltd. (tea manufacturer)
This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.