L-Theanine

Suggested Use

SUGGESTED USE: As a dietary supplement; take two (2) capsules daily on an empty stomach; or as directed by a healthcare professional.

• 

  Theanine L-Theanine Amino Acid Powder

  Prescribed For Life

  $24.99
• 

  Double Wood Supplements L-Theanine

  Double Wood Supplements4.8(111)

  $19.95
• 

  Central Market L-Theanine Capsules

  H-E-B

  $9.85
• 

  Sports Research L-Theanine Suntheanine Softgels

  Walmart - Sports Research4.7(1000)

  $13.96
• 

  L-Theanine

  Pure Prescriptions4.9(15)

  $30.99
• 

  L-Theanine Pure Encapsulations

  Blades Wellness and Aesthetics - Dr. Carrie Blades4.7(149)

  $64.20
• 

  Now Double Strength L-Theanine 200 mg

  NOW4.7(7600)

  $45.99
• 

  Dr aziz L-Theanine Supplement

  Dr Aziz Pharmacy

  $37.71

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.

• Nature's Market

  4.7 (84)

  Health food store

  2408 US-31W Unit B, White House, TN 37188

  Directions(615) 334-1867

• The Vitamin Shoppe

  4.4 (238)

  Vitamin & supplements store

  2225 Gallatin Pike N, Madison, TN 37115

  Directions(615) 859-4696

• Nutrition Faktory

  4.8 (51)

  Vitamin & supplements store

  202 N Anderson Ln, Hendersonville, TN 37075

  Directions(615) 431-5143

• Nutrishop Hendersonville

  5.0 (121)

  Vitamin & supplements store

  1050 Glenbrook Way Ste 310, Hendersonville, TN 37075

  Directions(615) 247-4629

• Your Healing Store

  4.8 (37)

  Vitamin & supplements store

  100 Maple Dr N, Hendersonville, TN 37075

  Directions(615) 824-9322

• Nutrition Outlet

  5.0 (13)

  Vitamin & supplements store

  3588 N Mt Juliet Rd, Mt. Juliet, TN 37122

  Directions(615) 773-6029

• Healthy Warehouse

  5.0 (1)

  Vitamin & supplements store

  2011 Tammy Dr, Springfield, TN 37172

  Directions(888) 625-7543

• GNC

  2.5 (32)

  Vitamin & supplements store

  206-A N Anderson Ln Ste 300, Hendersonville, TN 37075

  Directions(615) 348-0140

• The effects of green tea amino acid L-theanine consumption on the ability to manage stress and anxiety levels: a systematic review

  JL Williams, JM Everett, NM D'Cunha, D Sergi… - Plant foods for human …, 2020 - Springer

  … , L-theanine (L-THE) is associated with several health benefits… selection was restricted to studies performed on humans (single- and double-blind included) where an L-THE supplement …

  2020225 citations

• Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials

  J Cotter, CE Caddick, JL Harper… - Nutritional …, 2026 - Taylor & Francis

  … adults worldwide, however, the use of prescription and over-the-counter products may not … use as an adjunct to existing medicinal options given the severity, persistence and functional …

  20269 citations

• A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave®l-Theanine on Stress in a Healthy Adult …

  M Evans, AC McDonald, L Xiong, DC Crowley… - Neurology and …, 2021 - Springer

  … Because of the high prevalence of stress in North America, a safe supplement … ® l-Theanine on whole-scalp and frontal alpha power, midline theta power, and salivary cortisol in healthy…

  202146 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 …

  202529 citations

• L-theanine: A potential multifaceted natural bioactive amide as health supplement

  R Adhikary, V Mandal - Asian Pacific Journal of Tropical Biomedicine, 2017 - Elsevier

  … in modern therapeutics, which are used to prepare antibiotics, growth supplements or some other therapeutics. l-theanine is such a bioactive amide amino acid presented in different …

  201778 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

  … an emerging option for stress management [6]. The calming effects of l-theanine are believed … the Natural and Non-Prescription Health Product Directorate, Health Canada, with notice of …

  202424 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2013-12-24. DSLD Label ID: 27976. 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.