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Four Weeks of L-Theanine Lowered Stress Scores
L-theanine supplementation at 200 mg/day for four weeks significantly reduced stress-related symptoms including depression, anxiety, and sleep disturbances in 30 healthy adults. The treatment also improved cognitive functions, particularly verbal fluency and executive function, suggesting L-theanine's potential for promoting mental health in populations with stress-related ailments.
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Summary
L-theanine supplementation at 200 mg/day for four weeks significantly reduced stress-related symptoms including depression, anxiety, and sleep disturbances in 30 healthy adults. The treatment also improved cognitive functions, particularly verbal fluency and executive function, suggesting L-theanine's potential for promoting mental health in populations with stress-related ailments.
Tags
l-theanine · stress-reduction · cognitive-function · clinical-trial · sleep-quality · mental-health
Key entities
L-theanine (concept, 0.99) · stress-related symptoms (concept, 0.95) · cognitive function (concept, 0.95) · Pittsburgh Sleep Quality Index (concept, 0.92) · Yasukawa Z. (person, 0.85) · Ozeki M. (person, 0.85) · Taiyo Kagaku Co., Ltd. (organization, 0.9)
Classification
analysis · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/mcp-server@2.0.0, confidence 0.85, 2 Nov 2026