100% Pure L-Theanine 200 mg®

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
• 

  Quiet Mind Supplement

  NutraBio4.9(25)

  $44.99
• 

  Calm 60 Capsules

  Get Yok'd Nutrition5.0(8)

  $19.97
• 

  Kosher L-Theanine 200 Mg 60 Capsules

  Target4.7(789)

  $14.99
• 

  Nootropics Depot L-Theanine Capsules

  Nootropics Depot4.5(15)

  $15.99
• 

  Nutricost L-Theanine Capsules

  Nutricost4.8(7400)

  $10.97
• 

  L-Theanine

  Pure Prescriptions

  $30.99
• 

  L-THEANINE 200 capsules

  NutriKey

  $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.

• Absolute Nutrition

  4.8 (224)

  Vitamin & supplements store

  181 Hughes Rd Ste 8, Madison, AL 35758

  Directions(256) 325-0679

• The Vitamin Shoppe

  4.4 (172)

  Vitamin & supplements store

  6275 University Dr NW #42B, Huntsville, AL 35806

  Directions(256) 971-6907

• GNC

  4.0 (52)

  Vitamin & supplements store

  107 Brookridge Dr D, Madison, AL 35758

  Directions(256) 890-4083

• GNC

  3.5 (26)

  Vitamin & supplements store

  8000 Madison Blvd SUITE D 101, Madison, AL 35758

  Directions(256) 772-3307

• Nature's Apothecary

  4.8 (39)

  Vitamin & supplements store

  7441 Hwy 72 W, Madison, AL 35758

  Directions(256) 722-9198

• Sprouts Farmers Market

  4.6 (883)

  Vitamin & supplements store

  7504 Hwy 72 W, Madison, AL 35758

  Directions(256) 203-8334

• GNC

  4.0 (47)

  Vitamin & supplements store

  2801 Memorial Pkwy SW Spc 124, Huntsville, AL 35801

  Directions(256) 536-8381

• GNC

  4.3 (15)

  Vitamin & supplements store

  Main Exchange, Building #3220, Huntsville, AL 35808

  Directions(256) 883-8482

• 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

  … study that showed supplementation with l-theanine (200 mg/day) for four weeks in healthy adults significantly … Moreover, l-theanine supplementation (400 mg/day) for 17 days in …

  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

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

  J Cotter, CE Caddick, JL Harper… - Nutritional …, 2025 - Taylor & Francis

  … beneficial effects of L-theanine supplementation on sleep-… 9 of the 11 that used a dose ≥200 mg/day (see Table 1 ). … using healthy adults in Japan, beneficial effects of L-theanine …

  20259 citations

• Victory Caps-Nutrabio

  YS Bag - derofoods.nl

  … supplement market is overtly laden with supplements … L-Theanine (200mg) – L-Theanine is a unique amino acid … of pterostilbene and caffeine, in healthy adults. Paper presented at: …

• Victory Caps–Nutrabio

  V Caps–Nutrabio - workoutorigins.com

  … supplement market is overtly laden with supplements … L-Theanine (200mg) – L-Theanine is a unique amino acid … of pterostilbene and caffeine, in healthy adults. Paper presented at: …

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2020-02-26. DSLD Label ID: 212997. 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.