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: 2 Capsule(s) · 1–2 per day

Not Present

• 

  Nature's Way L-Theanine Supplement Vitamin | 200 mg | 60 Vegan Caps

  Swanson Health Products4.7(320)

  $15.29
• 

  Nature's Way Quick Calm Gummy

  CVS Pharmacy4.7(650)

  $15.49
• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Professional Supplement Center4.7(320)

  $17.99
• 

  Nature Made Chewable L Theanine Tablets

  Walmart4.4(69)

  $12.74
• 

  Nutricost L-Theanine Capsules

  Target4.8(7400)

  $8.99
• 

  L-Theanine 200 Mg 60 Veg Capsules

  Walsh Natural Health4.7(318)

  $22.99
• 

  Nature's Lab L-Theanine 200mg Capsules

  Natureslab.com4.7(39)

  $9.99
• 

  Now Foods L-Theanine 200mg Double Strength 120 Veg Capsules

  Walmart4.7(7600)

  $20.79

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.

• The Little Supplement Company

  5.0 (142)

  Vitamin & Supplements Shop

  22 Hyde Rd, Paignton TQ4 5BY

  Directions07711 393130

• Nutri-Link

  4.2 (5)

  Vitamin & Supplements Shop

  Milber Trading Estate, 24, Newton Abbot TQ12 4SG

  Directions0333 577 0404

• Holland & Barrett - Exeter

  3.8 (29)

  Vitamin & Supplements Shop

  Unit 1 High St, Exeter EX4 3LN

  Directions0330 058 2640

• Health Leads (UK) Ltd

  4.0 (15)

  Vitamin & Supplements Shop

  Horeb Business Park, Horeb, Llandysul SA44 4JG

  Directions01559 364711

• Gym Power

  5.0 (13)

  Vitamin & Supplements Shop

  38 Fore St, Redruth TR15 2AE

  Directions07514 572138

• Supplement Hub

  4.0 (6)

  Vitamin & Supplements Shop

  The Old Chapel, 8 Mortimer St, Sheffield City Centre, Sheffield S1 4SF

  Directions0114 700 5677

• Holland & Barrett - Sidmouth

  4.8 (6)

  Vitamin & Supplements Shop

  Fore St, Sidmouth EX10 8AF

  Directions0330 058 2640

• Supplement Place

  4.2 (10)

  Vitamin & Supplements Shop

  Unit 1, Golden Lion House, 23 Fore St, Seaton EX12 2LE

  Directions01297 553932

• 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… - Plant foods for human …, 2020 - Springer

  … acid, L-theanine (L-THE) is associated with several health … form of orally administered nutritional supplements, on stress … where L-THE as a supplement was compared to a control. Our …

  2020221 citations

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

  J Williams, J Kellett, PD Roach, A McKune… - 2016 - openresearch.newcastle.edu.au

  … More recently, L-THE (200 mg) was administered in the form of a beverage to 36 healthy … on blood pressure of chocolate containing L-THE (50–200 mg per serve of chocolate) [98]. This …

  201678 citations

• Cognitive and affective effects of L-Theanine: a systematic review and meta-analysis of 31 randomized trials

  C Gerolymos, E Saddier, L Boyer, G Fond - Molecular Psychiatry, 2026 - nature.com

  … a single oral dose of L-theanine on stress in healthy adults. Secondary outcomes encompassed … As the primary outcome, single-dose L-theanine (mostly 200 mg) significantly reduced …

  2026

• L‐Theanine: properties, synthesis and isolation from tea

  QV Vuong, MC Bowyer… - … of the Science of Food and …, 2011 - Wiley Online Library

  … In this review article, the properties and health benefits of … in nature, theanine is a chiral species and occurs in nature … Administration of 200 mg of L-theanine dissolved in 100 mL …

  2011321 citations

• Effects of L-theanine administration on stress-related symptoms and cognitive functions in healthy adults: a randomized controlled trial

  S Hidese, S Ogawa, M Ota, I Ishida, Z Yasukawa… - Nutrients, 2019 - mdpi.com

  … effects of acute L-theanine administration. The present study aimed to examine the effects of four weeks L-theanine administration (200 mg/day, four weeks) in a healthy population, ie, …

  2019362 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

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2025-03-25. DSLD Label ID: 327991. 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.