L-Theanine®

Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.

This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.

Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.

Serving Size: 1 Vegetarian Capsule(s) · 1 per day

Not Present

• 

  Douglas Laboratories L-Theanine 60 Capsules

  Covenant Health Products4.7(15)

  $42.50
• 

  Nature Made Chewable L Theanine Tablets

  Walmart4.4(68)

  $12.74
• 

  Pure L-Theanine

  PartiQlar

  $27.99
• 

  Nootropics Depot L-Theanine Capsules

  Nootropics Depot4.5(15)

  $15.99
• 

  Sports Research L-Theanine Suntheanine Softgels

  Sports Research4.7(1100)

  $38.95
• 

  L-Theanine

  Pure Prescriptions

  $30.99
• 

  Douglas Laboratories Sereniten Plus

  Blue Sky Vitamin4.8(48)

  $58.00
• 

  L-Theanine Pro

  ChiropracticOutfitters.com

  $31.00

Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.

Showing representative supplement & health retailers — search above for stores in your area.

• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• Willner Chemists

  4.7 (146)

  Vitamin & supplements store

  100 Park Ave, New York, NY 10017

  Directions(800) 633-1106

• SameDaySupplements.com

  4.5 (503)

  Vitamin & supplements store

  64 Nancy St Unit c, West Babylon, NY 11704

  Directions(631) 539-7339

• LEAN Nutraceuticals, Inc.

  5.0 (1)

  Vitamin & supplements store

  902 S Randall Rd #300c, St. Charles, IL 60174

  Directions(855) 382-4296

• Village Green Apothecary

  4.8 (489)

  Vitamin & supplements store

  5415 W Cedar Ln, Bethesda, MD 20814

  Directions(301) 530-0800

• GNC

  4.7 (201)

  Vitamin & supplements store

  2 Pennsylvania Plaza Ste 29B, New York, NY 10121

  Directions(212) 239-1251

• GNC

  4.4 (92)

  Vitamin & supplements store

  753 Broadway Spc 753, New York, NY 10003

  Directions(212) 380-5999

• Pure Lab Vitamins

  4.7 (6)

  Corporate office

  250 City Centre Ave #200, Ottawa, ON K1R 6K7, Canada

  Directions+1 613-706-1266

• Chronic Fatigue Syndrome Nutritional Supplementation Helps Reduce the Symptoms & Progression of Chronic Fatigue Syndrome

  LR McNamara - drladdvip.com

  … disclaimer after the article, and consult your personal health … L-theanine is an amino acid derived from green tea. It is not … You can buy from Douglas Labs by first creating a customer …

• l-theanine: From tea leaf to trending supplement–does the science match the hype for brain health and relaxation?

  R Dashwood, F Visioli - Nutrition Research, 2025 - Elsevier

  … of this nutraceutical supplement marketed for brain health and … in the use of l-theanine supplements at pharmacologic doses … this trending supplement for brain health and relaxation. …

  202526 citations

• Safety and Efficacy of AlphaWave®l-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo …

  M Moulin, DC Crowley, L Xiong, N Guthrie… - Neurology and …, 2024 - Springer

  … AlphaWave ® l-Theanine has been previously shown to … l-Theanine on stress among a moderately stressed, healthy … the safety and benefits of the longer-term use of l-theanine for self-…

  202427 citations

• medication-free alternatives for Long-term maintenance of Bipolar Disorder: a case Series

  MI Gurevich, CL Robinson - Global Advances in Health and …, 2015 - journals.sagepub.com

  … of ashwagandha, L-theanine, phosphatidylserine, magnolia, and epimedium (Cortisol Manager, Integrative Therapeutics); valerian root, passion flower, L-theanine, hops flower, wild …

  20158 citations

• The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis

  A Bulman, NM D'Cunha, W Marx, M Turner… - Sleep medicine …, 2025 - Elsevier

  … This systematic review ansd meta-analysis aimed to evaluate the effects of L-theanine, a non-… of L-theanine supplementation on sleep quality in humans of all ages and health status …

  202535 citations

• Douglas Laboratories

  P Kendall-Reed - douglaslabs.blogspot.ca

  … have a more significant impact on our health and weight. … Effects of L-theanine on the release of alpha-brain waves in … L-Theanine – a unique amino acid of green tea and its relaxation …

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2012-06-25. DSLD Label ID: 10342. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.