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.

Serving Size: 1–2 Capsule(s) · 1 per day

Not Present

• 

  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
• 

  Spring Valley L-Theanine Capsules 100 mg 100 Count

  Walmart4.4(296)

  $6.43
• 

  L-Theanine

  Hoey Apothecary

  $34.95
• 

  Natural Factors L Theanine 250 mg Veg Capsules (60 ct)

  Natural Factors

  $33.95
• 

  L-THEANINE 200 capsules

  NutriKey4.8(27)

  $21.50
• 

  Higher Nature Balance for Nerves Capsules

  W-Wellness4.7(32)

  $27.00

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.

• The Vitamin Shoppe

  4.5 (86)

  Vitamin & supplements store

  1775 Walden Ave #100, Buffalo, NY 14225

  Directions(716) 893-4716

• GNC

  4.5 (72)

  Vitamin & supplements store

  3471 Amelia Dr, Orchard Park, NY 14127

  Directions(716) 826-0897

• Next Level Nutrition-Buffalo

  4.8 (30)

  Sports nutrition store

  1050b Union Rd, West Seneca, NY 14224

  Directions(716) 453-5338

• ELAV8 Labs

  Vitamin & supplements store

  4040 Clinton St, West Seneca, NY 14224

  Directions(716) 408-6520

• Vitamin World

  3.7 (21)

  Vitamin & supplements store

  2730 Delaware Ave Ste 600, Buffalo, NY 14216

  Directions(716) 447-0103

• Marlene & Phils Vitamin & Herb

  4.9 (43)

  Health food store

  5855 Transit Rd, Depew, NY 14043

  Directions(716) 683-0256

• ReLoad Performance Nutrition

  5.0 (4)

  Vitamin & supplements store

  4110 St Francis Dr Rear, Hamburg, NY 14075

  Directions(716) 359-2788

• Bariatric Fusion

  4.3 (15)

  Vitamin & supplements store

  2701 Transit Rd, Elma, NY 14059

  Directions(866) 259-0602

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

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

  … Natural bioactive compounds from plants are of great importance in modern therapeutics, … to prepare antibiotics, growth supplements or some other therapeutics. l-theanine is such a …

  201778 citations

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

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

  … natural sources remain an important area of research. In this review article, the properties and health benefits … to obtain a high yield of theanine, teas possessing a high natural theanine …

  2011317 citations

• L-Theanine: An astounding sui generis integrant in tea

  E Sharma, R Joshi, A Gulati - Food chemistry, 2018 - Elsevier

  … l-theanine (l-Th), a non-protein amino acid present in tea, is a valuable nutraceutical product with unique health benefits … , its physiological role on human health and future prospects. …

  2018137 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 … in the use of l-theanine supplements at pharmacologic doses … 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-… evaluation of the impact of L-theanine on sleep architecture and …

  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 … L-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 2021-03-25. DSLD Label ID: 245639. 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.