Crick
HomeTrialsGenesDrugs23andMeGraphBlogContact
  • Home
  • Trials
  • Genes
  • Drugs
  • 23andMe
  • Graph
  • Blog
  • Contact
Crick

An open-source clinical intelligence platform. Explore clinical trials, gene networks, and molecular structures using public data sources.

Data Sources

  • ClinicalTrials.gov
  • OpenTargets
  • ClinVar
  • PubChem

Links

  • Contact
  • Privacy

© 2026 Crick. All rights reserved.

Crick is for educational purposes only. Not medical advice.

Results for “L-theanine”

31 trials

Filters

Phase
Early Phase 1
Phase 1
Phase 2
Phase 3
Phase 4
Status
Recruiting
Active, Not Recruiting
Not Yet Recruiting
Completed
Enrolling by Invitation

Showing 20 of 31 results

Not applicableLooking for participantsNCT07319117
What this trial is testing

Evaluation of the Impact of a Nutritional Formulation on Cognitive Performance Following Stress Exposure.

Who this might be right for
Cognitive AssessmentWorking MemoryExecutive Function (Cognition)+14 more
Leeds Beckett University 40
Not applicableStudy completedNCT06621797
What this trial is testing

Effects of Caffeine, L-Theanine, and Diaphragmatic Breathing on Esports Players' Performance

Who this might be right for
EsportsCaffeineL-theanine
Hacettepe University 15
Not applicableUnknownNCT01831986
What this trial is testing

Pregnenolone and L-theanine Augmentation in the Treatment for Schizophrenia and Schizoaffective Disorders

Who this might be right for
SchizophreniaSchizoaffective Disorder
Sha'ar Menashe Mental Health Center 60
Not applicableStudy completedNCT05543811
What this trial is testing

The Influence of Food for Special Dietary Use - Spread Enriched With 5-hydroxytryptophan, Theanine and Gamma-aminobutyric Acid on Psychophysiological Functions of Subjects Without Meaningful Organic and Cognitive Pathology

Who this might be right for
Cognitive ChangeMemory; Disturbance, MildEmotional Regulation+1 more
Federal State Budgetary Scientific Institution 140
Not applicableStudy completedNCT06224569
What this trial is testing

Understanding the Effects of Daily Tea Consumption on Attention, Sleep, and Mood, in Healthy Adults

Who this might be right for
The Focus of the Study is Healthy Volunteers
University of Aberdeen 30
Not applicableStudy completedNCT05592561
What this trial is testing

Impact of Supplements on Stress Markers

Who this might be right for
Physiological Stress
Texas State University 109
Testing effectiveness (Phase 2)Study completedNCT00291070
What this trial is testing

Effects of L-Theanine in Boys With ADHD

Who this might be right for
Attention Deficit Hyperactivity Disorder
University of British Columbia 100
Very early researchStudy completedNCT03533556
What this trial is testing

Effects of L-theanine and Caffeine on Attention and Attention-related Brain Activity of Children With Attention Deficit Hyperactivity Disorder

Who this might be right for
Attention Deficit Hyperactivity Disorder
Texas Tech University 6
Very early researchLooking for participantsNCT07220447
What this trial is testing

L-Theanine to Support Relaxation and Mood for Cancer Patients in Surveillance

Who this might be right for
Hematopoietic and Lymphatic System NeoplasmMalignant Solid Neoplasm
City of Hope Medical Center 50
Not applicableStudy completedNCT07225608
What this trial is testing

The Acute Effects of Liquid IV's Pre-Workout Supplement on Muscle Endurance & Strength, Energy, and Cognition

Who this might be right for
Physical PerformanceExercise PerformanceEndurance Exercise+3 more
Applied Science & Performance Institute 27
Not applicableStudy completedNCT04391452
What this trial is testing

Dietary Supplement With Magnesium, Vitamins, Rhodiola and L-theanine Stressed Subjects: Randomized Study Versus Placebo (MAGRITTE)

Who this might be right for
Stress, Psychological
University Hospital, Clermont-Ferrand 121
Not applicableStudy completedNCT05830565
What this trial is testing

Management of Occasional or Anticipatory Stress by Consumers of a Food Supplement

Who this might be right for
Stress
Larena SAS 113
Very early researchStudy completedNCT04749745
What this trial is testing

Effects of L-theanine on Motor Cortex Excitability in Healthy Subjects: A Paired-Pulse TMS Study

Who this might be right for
Cortical ExcitabilityPsychiatric Disorder
Butler Hospital 11
Large-scale testing (Phase 3)Study completedNCT00372151
What this trial is testing

L-Theanine in the Management of Schizophrenia

Who this might be right for
Schizophrenia
Sha'ar Menashe Mental Health Center 60
Not applicableStudy completedNCT07665840
What this trial is testing

Effects of L-Theanine and Hericium Erinaceus Gummies on Psychological, Cognitive, and Sleep Quality in University Students

Who this might be right for
Psychological StressAnxietyDepression+2 more
University of Nottingham Malaysia 67
Not applicableLooking for participantsNCT07135232
What this trial is testing

The Effects of Resistance Training and a Plant-Based Supplement on Perimenopausal Symptoms and Muscle Health.

Who this might be right for
PerimenopauseMenopause
Leeds Beckett University 72
Post-approval studies (Phase 4)Study completedNCT00981955
What this trial is testing

The Effects of Caffeine and L-theanine Both Alone and in Combination on Cerebral Blood Flow, Cognition and Mood

Who this might be right for
Cognitive FunctionMood
Northumbria University 24
Not applicableStudy completedNCT07004023
What this trial is testing

A Clinical Trial to Assess the Efficacy of a Single-dose of AlphaWave® L-Theanine on Cognitive Function in Healthy Adults With Moderate Stress

Who this might be right for
Cognitive FunctionModerate Stress
Ethical Naturals, Inc. 40
Not applicableStudy completedNCT05854017
What this trial is testing

Effects of a Theanine for Stress Relief Formulation in Individuals Who Report Occasional Moderate High Levels of Stress.

Who this might be right for
Stress
Supplement Formulators, Inc. 104
Not applicableLooking for participantsNCT07682532
What this trial is testing

L-THEANINE AND MEDITERRANEAN DIET ON RBD, GI FUNCTION, AND INFLAMMATION IN PARKINSON'S DISEASE

Who this might be right for
Parkinson Disease (PD)
Medipol University 52
Next Page