100% Pure L-Theanine 200 Milligrams®

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 Vegetable Capsule(s) · 1 per day

Not Present

• 

  L-Theanine 90 Capsules

  Ultimate Sport Nutrition4.8(72)

  $23.95
• 

  l-Theanine

  Spectrum Innovations4.8(186)

  $10.00
• 

  Kosher L-Theanine 200 Mg 60 Capsules

  iHerb4.7(789)

  $10.05
• 

  Nutricost L-Theanine Capsules

  Vitacost.com4.8(2000)

  $11.95
• 

  Nootropics Depot L-Theanine Capsules

  Nootropics Depot4.5(15)

  $15.99
• 

  L-THEANINE 200 capsules

  NutriKey4.8(27)

  $21.50
• 

  Nature Made Chewable L Theanine Tablets

  Walmart4.4(68)

  $12.74
• 

  L-Theanine

  Pure Prescriptions

  $30.99

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• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• GNC

  4.7 (202)

  Vitamin & supplements store

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

  Directions(212) 239-1251

• The Vitamin Shoppe

  4.5 (161)

  Vitamin & supplements store

  185 US-1 S, Metuchen, NJ 08840

  Directions(732) 635-1790

• GNC

  4.4 (92)

  Vitamin & supplements store

  753 Broadway Spc 753, New York, NY 10003

  Directions(212) 380-5999

• Supplement Superstore

  5.0 (932)

  Vitamin & supplements store

  17245 Chesterfield Airport Rd, Chesterfield, MO 63005

  Directions(636) 536-3288

• Lindberg Nutrition

  4.6 (146)

  Vitamin & supplements store

  3804 Sepulveda Blvd, Torrance, CA 90505

  Directions(310) 378-9490

• GNC

  4.1 (152)

  Vitamin & supplements store

  1755 Broadway, New York, NY 10019

  Directions(212) 247-2309

• GNC

  3.5 (61)

  Vitamin & supplements store

  1645 2nd Ave #85th, New York, NY 10028

  Directions(212) 734-0333

• 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

  … , supplementation with 200–450 mg/day of Ltheanine appears to be a safe and effective way to support healthy … 9 of the 11 that used a dose ≥200 mg/day (see Table 1). Improvements …

  20269 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. …

  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 … ® l-Theanine is a dietary supplement containing 200 mg of …

  202427 citations

• Effect of green tea amino acid l-theanine on physiological responses: a protocol for clinical trial

  J Williams, NM D'Cunha… - Exploratory …, 2020 - researchprofiles.canberra.edu.au

  … (200 mg) imbedded in the food matrix (mango sorbet) in comparison to supplementation of pure L-… Kinetics of L-theanine uptake and metabolism in healthy participants are comparable …

  20202 citations

• Dietary supplementation with Lactium and L-theanine alleviates sleep disturbance in adults: a double-blind, randomized, placebo-controlled clinical study

  SE Lim, HS Kim, S Lee, EY Kang, JH Lim, BY Kim… - Frontiers in …, 2024 - frontiersin.org

  … of L-theanine intake on gut health in participant. Our study represents one of the first attempts to explore this potential health … The L-theanine tablet was a 700 mg gray tablet containing …

  202410 citations

• Unlocking the potential of l‐α‐glycerylphosphorylcholine in the food industry: From safety approvals to market prospects

  J Cao, E Su - Comprehensive Reviews in Food Science and …, 2025 - Wiley Online Library

  … , the dietary supplementation with l-α-GPC at 1200 mg/day … omega-3, l-theanine) can be combined with l-α-GPC in these … brands like NOW Foods, NutraBio Labs, and Life Extension …

  20255 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2015-10-22. DSLD Label ID: 51093. 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.