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 Capsule(s) · 1 per day

Not Present

• 

  Country Life L-Theanine 200 mg 60 Vegetarian Capsules

  Country Life Vitamins4.8(101)

  $30.29
• 

  Country Life Stress Shield 60 Capsules

  Country Life Vitamins4.5(62)

  $24.19
• 

  Country Life Mood Support 60 Vegan Capsules

  iHerb4.7(12)

  $39.99
• 

  Country Life Stress Shield Nighttime 60 Veggie Caps

  Country Life Vitamins4.7(48)

  $42.19
• 

  Country Life L-Theanine Smooth Melts

  William's Natural Foods4.8(69)

  $31.69
• 

  Nature Made Chewable L Theanine Tablets

  Walmart4.4(68)

  $12.74
• 

  Country Life Brain Fog Rescue Supplement

  Instacart4.1(11)

  $40.29
• 

  Kosher L-Theanine 200 Mg 60 Capsules

  Swanson Health Products4.7(789)

  $9.42

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• Supplements Lab

  4.9 (224)

  Vitamin & Supplements Shop

  Crown Arcade Unit C, Kingston upon Thames KT1 1JB

  Directions020 8549 7165

• Supplemented

  4.7 (192)

  Vitamin & Supplements Shop

  Online Retail Ltd Box 1031A, Surbiton, Kingston upon Thames KT1 9AH

  Directions

• Vitamin Shop HOUNSLOW

  5.0 (265)

  Vitamin & Supplements Shop

  102 High St, Hounslow TW3 1NH

  Directions020 8616 4040

• Fitandfat

  5.0 (321)

  Vitamin & Supplements Shop

  Inside the post office, 187 Uxbridge Rd, London W13 9AJ

  Directions020 8050 1277

• London Supplements

  3.7 (84)

  Vitamin & Supplements Shop

  13, Waverley Industrial Park Waverley Industrial Estate, Hailsham Dr, Harrow HA1 4TR

  Directions020 8863 0300

• Vitamin Shop ACTON

  4.8 (76)

  Vitamin & Supplements Shop

  263 The Vale, London W3 7QA

  Directions020 8743 1907

• Liberty Supplements Warehouse

  4.5 (29)

  Sports Nutrition Shop

  Unit 4B, Liberty Supplements Warehouse, 158 Dukes Rd, London W3 0SL

  Directions020 8062 0480

• Novomins

  4.9 (480)

  E-commerce service

  Suite 1000, 405 King's Rd, London SW10 0BB

  Directions01863 723207

• 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

• Benefits of l-theanine supplementation and its possible role in clinical use–review

  K Womperski, J Woźniak, J Szymonik, S Szopa… - Quality in Sport, 2024 - apcz.umk.pl

  … One of them – l-theanine - seems to have a multidirectional influence on human health. … [10] White DJ et al. reports that administration of 200 mg of l-theanine lowers the subjective …

  20242 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

  … dextran sulfate sodium (DSS), and L-theanine treatment (200 mg/kg/day) could improve DSS-… members, it was found that L-theanine supplementation could contribute to the reduction of …

  2022171 citations

• l-Theanine promotes cultured human Sertoli cells proliferation and modulates glucose metabolism

  TR Dias, RL Bernardino, MG Alves, J Silva… - European journal of …, 2019 - Springer

  … are mostly ascribed to higher doses of 200 mg, which correspond to a … regulation for its ingestion varies among countries. While in Japan … disruptions caused by some health conditions. …

  201934 citations

• Bioactive components of tea: cancer, inflammation and behavior

  EG de Mejia, MV Ramirez-Mares… - Brain, behavior, and …, 2009 - Elsevier

  … In regards to brain health, green tea catechins have been recognized as multifunctional compounds for neuroprotection with beneficial effects on vascular function and mental …

  2009339 citations

• Phytochemistry, modes of action and beneficial health applications of green tea (Camellia sinensis) in humans and animals

  M Saeed, ME Abd El-Hack, M Alagawany… - International Journal of …, 2017 - imrpress.com

  … uses of L theanine as feed supplementation and its potential … , African, South American countries with tropical and temperate … 30 min of L-theanine administration (with a 200 mg dose) …

  201736 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2025-08-22. DSLD Label ID: 333296. 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.