L-Theanine 100 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.

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

Not Present

• 

  California Gold Nutrition L-Theanine AlphaWave Veggie Capsules

  iHerb4.7(14000)

  $3.97Lowest
• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  iHerb4.7(320)

  $13.82
• 

  Nutricost L-Theanine Powder

  iHerb4.7(1600)

  $15.95
• 

  Spring Valley L-Theanine Capsules 100 mg 100 Count

  Walmart4.4(306)

  $6.43
• 

  L-Theanine Capsules

  Target5.0(2)

  $15.95
• 

  NOW Foods L-Theanine 100 mg 90 Veg Capsules

  NOW4.8(31)

  $21.99
• 

  L-Theanine

  Pure Prescriptions

  $30.99
• 

  L-T Complex (Theanine) Relaxation & Focus

  Walmart - Pain & Stress Center

  $20.95

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.

• Willner Chemists

  4.7 (146)

  Vitamin & supplements store

  100 Park Ave, New York, NY 10017

  Directions(800) 633-1106

• Nutrition Depot

  5.0 (112)

  Vitamin & supplements store

  2005 Southwest Fwy, Houston, TX 77098

  Directions(346) 516-0878

• Supplement Warehouse

  4.7 (229)

  Vitamin & supplements store

  181 W Crossroads Pkwy Ste F, Bolingbrook, IL 60440

  Directions(630) 965-8526

• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• Physicians Preference Vitamins

  4.7 (62)

  Vitamin & supplements store

  20214 Braidwood Dr #160, Katy, TX 77450

  Directions(281) 646-1659

• Village Green Apothecary

  4.8 (490)

  Vitamin & supplements store

  5415 W Cedar Ln, Bethesda, MD 20814

  Directions(301) 530-0800

• GNC

  4.4 (92)

  Vitamin & supplements store

  753 Broadway Spc 753, New York, NY 10003

  Directions(212) 380-5999

• GNC

  4.7 (202)

  Vitamin & supplements store

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

  Directions(212) 239-1251

• The effects of green tea amino acid L-theanine consumption on the ability to manage stress and anxiety levels: a systematic review

  JL Williams, JM Everett, NM D'Cunha, D Sergi… - … foods for human nutrition, 2020 - Springer

  … , L-theanine (L-THE) is associated with several health benefits… form of orally administered nutritional supplements, on stress … Our findings suggest that supplementation of 200–400 mg/…

  2020221 citations

• Anti-stress, behavioural and magnetoencephalography effects of an L-theanine-based nutrient drink: a randomised, double-blind, placebo-controlled …

  DJ White, S De Klerk, W Woods, S Gondalia, C Noonan… - Nutrients, 2016 - mdpi.com

  … Based on these potential benefits to mood and general health, l-theanine is emerging as an … Of particular relevance to the present research, daily supplementation with 300–400 mg of …

  2016180 citations

• L-theanine: a prospective natural medicine

  S Chatterjee, A Chatterjee… - International journal of …, 2016 - researchgate.net

  … information of L- theanine with reference to health benefits. … Magnesium nutritional status plays a vital role in synthesis … as a dietary supplement, and according to FDA L-theanine can be …

  201618 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

• 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

  … Though many of the included studies were conducted using healthy adults in Japan, beneficial effects of L-theanine on sleep related-measures were also reported in randomised, …

  20259 citations

• Treatment of refractory obsessive–compulsive disorder with nutraceuticals (TRON): a 20-week, open label pilot study

  J Sarris, GJ Byrne, G Oliver, L Cribb, S Blair-West… - CNS …, 2022 - cambridge.org

  … Magnesium supplementation in mice attenuates anxiety-… in this study, particularly given that L-theanine is well known to … As a medical research institute, NICM Health Research Institute …

  202212 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2022-09-22. DSLD Label ID: 272445. 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.