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 Capsule(s) · 1 per day

Not Present

• 

  Higher Nature Theanine Capsules

  W-Wellness4.5(17)

  $28.00
• 

  Spring Valley L-Theanine Capsules 100 mg 100 Count

  Walmart4.4(296)

  $6.43Lowest
• 

  Vitamatic L-Theanine 400mg 240 Tablets

  Target4.7(88)

  $16.99
• 

  Nature's Craft L-Theanine Organic Liquid Drops

  iHerb4.7(134)

  $15.99
• 

  L-Theanine

  Pure Prescriptions4.9(15)

  $30.99
• 

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

  Natural Factors

  $33.95
• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Natures Food Markets4.7(313)

  $17.29
• 

  L-THEANINE 200 capsules

  NutriKey4.8(27)

  $21.50

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.

• GNC

  3.8 (25)

  Vitamin & supplements store

  1380 S Providence Center Dr C, Cedar City, UT 84720

  Directions(435) 586-8490

• Balance of Nature

  4.6 (763)

  Vitamin & supplements store

  1568 S River Rd #200, St. George, UT 84790

  Directions(800) 246-8751

• Healthy Body Nutrition

  5.0 (2)

  Vitamin & supplements store

  494 E Tabernacle St #2, St. George, UT 84770

  Directions(435) 862-1536

• Sevier Valley Health Essentials

  4.7 (27)

  Health food store

  78 N Main St, Richfield, UT 84701

  Directions(435) 893-9164

• Angstrom Minerals

  4.8 (8)

  Health food store

  315 N 400 W Rd, Fillmore, UT 84631

  Directions(855) 743-5485

• Vitality Nutrition

  4.9 (89)

  Vitamin & supplements store

  107 S 500 W Unit A, Bountiful, UT 84010

  Directions(801) 292-6662

• GNC

  3.7 (49)

  Vitamin & supplements store

  1770 Red Cliffs Dr Spc 1166, St. George, UT 84790

  Directions(435) 674-9955

• Rezealiant Living

  5.0 (1)

  Vitamin & supplements store

  2331 Park Ave, Cedar City, UT 84721

  Directions(435) 200-4530

• 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 …

  2011318 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

• L-theanine as a functional food additive: Its role in disease prevention and health promotion

  J Williams, J Kellett, P Roach, A McKune… - …, 2016 - pureportal.coventry.ac.uk

  … of L-theanine uptake and metabolism in healthy participants are comparable after ingestion of L-theanine via … Effect of L-theanine on sensorimotor gating in healthy human subjects. …

  201677 citations

• Exploring the molecular mechanisms and therapeutic benefits of L-theanine in counteracting inflammation

  S Deb, A Borah - PharmaNutrition, 2024 - Elsevier

  … L-theanine, an amino acid primarily found in tea leaves, has garnered significant attention … health benefits, especially its anti-inflammatory properties. Research suggests that L-theanine …

  20243 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2021-04-22. DSLD Label ID: 246112. 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.