- Conditions
- Theanine, (L)-Isomer
- Interventions
- L-theanine capsule, Placebo capsule
- Dietary Supplement
- Lead sponsor
- The University of Texas Health Science Center, Houston
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 26 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2011 – 2012
- U.S. locations
- 1
- States / cities
- Sugar Land, Texas
Search Results
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Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.
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Showing 1–21
of 21
matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
- Conditions
- Cortical Excitability, Psychiatric Disorder
- Interventions
- L-theanine, Placebo
- Drug
- Lead sponsor
- Butler Hospital
- Other
- Eligibility
- 18 Years to 65 Years
- Enrollment
- 11 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2020 – 2021
- U.S. locations
- 1
- States / cities
- Providence, Rhode Island
- Conditions
- Attention Deficit Hyperactivity Disorder
- Interventions
- L-theanine, Caffeine, L-theanine-Caffeine Combination, Placebo
- Dietary Supplement · Other
- Lead sponsor
- Texas Tech University
- Other
- Eligibility
- 8 Years to 17 Years · Male only
- Enrollment
- 6 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2018
- U.S. locations
- 1
- States / cities
- Lubbock, Texas
- Conditions
- Hematopoietic and Lymphatic System Neoplasm, Malignant Solid Neoplasm
- Interventions
- Survey Administration, Theanine
- Other · Drug
- Lead sponsor
- City of Hope Medical Center
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 50 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2026 – 2027
- U.S. locations
- 4
- States / cities
- Duarte, California • Huntington Beach, California • Irvine, California
- Conditions
- Sleep
- Interventions
- Placebo Capsule, POWEROFF Capsule
- Dietary Supplement
- Lead sponsor
- NYU Langone Health
- Other
- Eligibility
- 18 Years to 65 Years
- Enrollment
- 60 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2017 – 2018
- U.S. locations
- 1
- States / cities
- New York, New York
- Conditions
- Attention, Mood
- Interventions
- Cranberry Juice Product
- Dietary Supplement
- Lead sponsor
- Ocean Spray Cranberries, Inc.
- Industry
- Eligibility
- 18 Years to 45 Years
- Enrollment
- 25 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2021
- U.S. locations
- 1
- States / cities
- Chicago, Illinois
- Conditions
- Cognitive Performance
- Interventions
- L-theanine, Caffeine supplement, N1 app
- Drug · Dietary Supplement · Device
- Lead sponsor
- Icahn School of Medicine at Mount Sinai
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 57 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2019 – 2020
- U.S. locations
- 1
- States / cities
- New York, New York
- Conditions
- Sleep, Sleep Disturbance, Sleep Hygiene
- Interventions
- Beam Organics Dream Powder, Beam Organics Dream Powder Extra Strength, Placebo
- Dietary Supplement
- Lead sponsor
- Beam
- Industry
- Eligibility
- 24 Years to 50 Years
- Enrollment
- 64 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2022
- U.S. locations
- 1
- States / cities
- Santa Monica, California
- Conditions
- Sleep
- Interventions
- SleepWhale Natural Sleep Drops
- Dietary Supplement
- Lead sponsor
- Efforia, Inc
- Industry
- Eligibility
- Not listed
- Enrollment
- 100 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2025 – 2026
- U.S. locations
- 1
- States / cities
- New York, New York
- Conditions
- Attention Deficit Hyperactivity Disorder (ADHD), Autism Spectrum Disorder (ASD)
- Interventions
- L-theanine and paraxanthine, Placebo
- Dietary Supplement
- Lead sponsor
- Texas Tech University Health Sciences Center
- Other
- Eligibility
- Male only
- Enrollment
- 17 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2025 – 2026
- U.S. locations
- 1
- States / cities
- Lubbock, Texas
- Conditions
- Stress
- Interventions
- Theanine Formulation, Placebo
- Dietary Supplement
- Lead sponsor
- Supplement Formulators, Inc.
- Industry
- Eligibility
- 21 Years to 65 Years
- Enrollment
- 14 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2022
- U.S. locations
- 1
- States / cities
- Fort Lauderdale, Florida
- Conditions
- L-theanine
- Interventions
- Theanine, Caffeine, Theanine-Caffeine Combination, Placebo
- Other
- Lead sponsor
- Texas Tech University
- Other
- Eligibility
- 18 Years to 60 Years · Male only
- Enrollment
- 9 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2016
- U.S. locations
- 1
- States / cities
- Lubbock, Texas
- Conditions
- Healthy
- Interventions
- All Active Supplement Combinations (Ashwagandha, Rhodiola rosea, magnesium threonate, L-theanine, and apigenin)), AM Active Supplement Combination (Ashwagandha and Rhodiola rosea), PM Active Supplement Combination (Magnesium threonate, L-theanine, and apigenin), AM and PM Placebo
- Combination Product · Other
- Lead sponsor
- University of South Carolina
- Other
- Eligibility
- 18 Years to 50 Years
- Enrollment
- 115 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2025 – 2026
- U.S. locations
- 1
- States / cities
- Columbia, South Carolina
- Conditions
- Physiological Stress
- Interventions
- mental stress task
- Other
- Lead sponsor
- Texas State University
- Other
- Eligibility
- 18 Years to 40 Years
- Enrollment
- 109 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2022 – 2023
- U.S. locations
- 1
- States / cities
- San Marcos, Texas
- Conditions
- Anxiety, Stress
- Interventions
- Alcohol Alternative Herbal Tincture (Test Product), Placebo
- Dietary Supplement
- Lead sponsor
- Apothekary
- Industry
- Eligibility
- 21 Years to 65 Years
- Enrollment
- 80 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2024
- U.S. locations
- 1
- States / cities
- Santa Monica, California
- Conditions
- Healthy
- Interventions
- Placebo, Dietary Supplement with actives
- Dietary Supplement
- Lead sponsor
- Olly, PBC
- Industry
- Eligibility
- 5 Years to 14 Years
- Enrollment
- 80 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2025
- U.S. locations
- 1
- States / cities
- Fair Lawn, New Jersey
- Conditions
- Absorption, Pharmacokinetic
- Interventions
- Hydration Multiplier + Energy, Hydration Multiplier + Sleep, Energy Comp, Sleep Comp
- Dietary Supplement · Other
- Lead sponsor
- Liquid I.V.
- Other
- Eligibility
- 18 Years to 55 Years
- Enrollment
- 37 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2023 – 2024
- U.S. locations
- 1
- States / cities
- Raritan, New Jersey
- Conditions
- ADHD, Attention Difficulties, Mood, Anxiety, Caffeine
- Interventions
- Proper Wild energy shot
- Other
- Lead sponsor
- Proper Wild, Inc.
- Industry
- Eligibility
- 18 Years to 55 Years
- Enrollment
- 40 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2023
- U.S. locations
- 1
- States / cities
- Santa Monica, California
- Conditions
- Stress
- Interventions
- Theanine for stress relief formulation, Placebo
- Dietary Supplement
- Lead sponsor
- Supplement Formulators, Inc.
- Industry
- Eligibility
- 21 Years to 65 Years
- Enrollment
- 104 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2023 – 2025
- U.S. locations
- 1
- States / cities
- Fort Lauderdale, Florida
- Conditions
- Mental Fatigue
- Interventions
- Caffeine Blend, Sugar Pill
- Dietary Supplement · Other
- Lead sponsor
- University of Mary Hardin-Baylor
- Other
- Eligibility
- 18 Years to 25 Years · Male only
- Enrollment
- 31 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2016
- U.S. locations
- 1
- States / cities
- Belton, Texas
- Conditions
- Physical Performance, Exercise Performance, Endurance Exercise, Perceived Exertion, Mood, Energy
- Interventions
- proprietary pre-workout supplement, Control placebo
- Dietary Supplement
- Lead sponsor
- Applied Science & Performance Institute
- Industry
- Eligibility
- 18 Years to 55 Years
- Enrollment
- 27 participants
- Healthy volunteers
- Accepts healthy volunteers
- Timeline
- 2025 – 2026
- U.S. locations
- 1
- States / cities
- Tampa, Florida