Theanine

Suggested Use

Directions: Adults take 1-2 capsules a day; children over 8 years; 1 capsule a day; between meals; or as your health professional advises. Do not exceed recommended daily intake.

• 

  Higher Nature Theanine Capsules

  W-Wellness4.5(17)

  $28.00
• 

  Nature's Craft L-Theanine Organic Liquid Drops

  iHerb4.7(134)

  $15.99
• 

  Vitamatic L-Theanine 400mg 240 Tablets

  Target4.7(88)

  $16.99
• 

  Higher Nature Balance for Nerves Capsules

  W-Wellness4.7(32)

  $27.00
• 

  L-Theanine (Wellness Pack)

  Washington Health And Drug

  $40.70
• 

  L-THEANINE 200 capsules

  NutriKey4.8(27)

  $21.50
• 

  L-Theanine

  RTHM5.0(1)

  $1317.00
• 

  L-Theanine – Stress Relief & Mental Focus Support Green Bay

  ftfpt.com

  $59.99

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.

• Nutrition World

  4.9 (14)

  Vitamin & supplements store

  466 SW Port St Lucie Blvd #113, Port St. Lucie, FL 34953

  Directions(772) 380-6467

• Superset Sports Nutrition PSL, LLC

  5.0 (167)

  Vitamin & supplements store

  1399 NW, St Lucie W Blvd, Port St. Lucie, FL 34986

  Directions(772) 879-9767

• The Vitamin Shoppe

  4.6 (218)

  Vitamin & supplements store

  1756 St Lucie W Blvd E, Port St. Lucie, FL 34986

  Directions(772) 879-2405

• GNC

  4.3 (36)

  Vitamin & supplements store

  3016 NW Federal Hwy, Jensen Beach, FL 34957

  Directions(772) 692-1386

• Joanne's Nutrition World & Wellness Center

  4.9 (67)

  Vitamin & supplements store

  North 101, N US Hwy 1 #118, Fort Pierce, FL 34950

  Directions(772) 464-3598

• The Vitamin Shoppe

  4.5 (118)

  Vitamin & supplements store

  2960 NW Federal Hwy, Jensen Beach, FL 34957

  Directions(772) 692-7878

• GNC

  4.3 (27)

  Vitamin & supplements store

  10640 SW Vlg Pkwy, Port St. Lucie, FL 34987

  Directions(772) 345-3622

• GNC

  4.4 (33)

  Vitamin & supplements store

  2295 SE Federal Hwy, Stuart, FL 34994

  Directions(772) 286-8453

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

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

  … , growth supplements or some other therapeutics. l-theanine is such a bioactive amide amino acid presented in different plants and fungi, especially in tea. Theanine has influential …

  201778 citations

• L‐Theanine: properties, synthesis and isolation from tea

  QV Vuong, MC Bowyer… - … of the Science of Food and …, 2011 - Wiley Online Library

  … and health benefits of theanine are summarised and the synthesis and isolation of theanine … of harvest.8, 10, 11 In order to obtain a high yield of theanine, teas possessing a high natural …

  2011318 citations

• Green tea and theanine: health benefits

  R Cooper - International journal of food sciences and nutrition, 2012 - Taylor & Francis

  … production of polyphenols, the tea plant converts theanine … high in catechins (good for antioxidant benefits), while leaves harvested during another time of year may be higher in theanine…

  2012133 citations

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

  202525 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

  … using healthy adults in Japan, beneficial effects of L-theanine … However, this area would benefit from further large, high-… of the impact of L-theanine on sleep architecture and associated …

  20269 citations

• L-theanine: A unique functional amino acid in tea (Camellia sinensis L.) with multiple health benefits and food applications

  MY Li, HY Liu, DT Wu, A Kenaan, F Geng, HB Li… - Frontiers in …, 2022 - frontiersin.org

  … Due to the unique characteristics and beneficial functions, L-theanine has potential … -theanine content in teas, the main health benefits and related molecular mechanisms of L-theanine, …

  2022167 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2020-04-23. DSLD Label ID: 217124. 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.