Theanine®

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: 1–2 Capsule(s) · 1 per day

Not Present

• 

  Higher Nature Theanine Capsules

  W-Wellness4.5(17)

  $33.00
• 

  L-Theanine Capsules

  Target5.0(1)

  $15.95
• 

  Nature's Craft L-Theanine Organic Liquid Drops

  iHerb4.7(141)

  $15.99
• 

  Vitamatic L-Theanine 400mg 240 Tablets

  Walmart - Vitamatic4.7(97)

  $16.99
• 

  L-Theanine

  Pure Prescriptions

  $30.99
• 

  L-Theanine Ortho Molecular Products 60 Capsules

  Pain & Wellness Solutions

  $44.99
• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Natures Food Markets4.7(318)

  $17.29
• 

  L-Theanine – Stress Relief & Mental Focus Support Green Bay

  ftfpt.com

  $59.99

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• Nayble Health & Sports

  5.0 (139)

  Vitamin & Supplements Shop

  18 Chamberlayne Rd, London NW10 3JD

  Directions020 7625 5111

• Love Life Supplements

  4.8 (87)

  Vitamin & Supplements Shop

  wellington house, East Rd, Petersfield, Cambridge CB1 1BH

  Directions0800 122 3351

• ITL Health

  5.0 (37)

  Vitamin & Supplements Shop

  50 Broadway, London SW1H 0BL

  Directions0118 321 7628

• RightNutri

  4.9 (78)

  Vitamin & Supplements Shop

  26 Queenstown Rd, London SW8 3RX

  Directions0800 098 8888

• London Supplements

  3.7 (84)

  Vitamin & Supplements Shop

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

  Directions020 8863 0300

• Nutri Tailor

  5.0 (13)

  Vitamin & Supplements Shop

  85 Great Portland St, London W1W 7LT

  Directions

• Supplemented

  4.7 (192)

  Vitamin & Supplements Shop

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

  Directions

• Planetis Natural Health & Nutrition

  5.0 (38)

  Vitamin & Supplements Shop

  32 Clifton Rd, London W9 1ST

  Directions020 7289 4551

• Green tea and theanine: health benefits

  R Cooper - International journal of food sciences and nutrition, 2012 - Taylor & Francis

  … catechins and the amino acid, theanine. Studies on the health benefits of drinking tea, particularly … Recent studies describing the health benefits of these compounds will be reviewed. …

  2012134 citations

• Theanine: the unique amino acid in the tea plant as an oral hepatoprotective agent

  D Wang, Q Gao, T Wang, F Qian… - Asia Pacific Journal of …, 2017 - search.informit.org

  … of tea, the health benefits of theanine have also become prominent in recent years. Theanine is a … The International Union of Pure and Applied Chemistry name of theanine is 2-amino-4(…

  201739 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

  … content of the non-proteinogenic amino acid theanine, which is found within the tea leaves. … purification of theanine, as well as to examine its potential benefits related to human health. …

  201678 citations

• The effect of L-theanine supplementation on the immune system of athletes exposed to strenuous physical exercise

  A Juszkiewicz, A Glapa, P Basta… - Journal of the …, 2019 - Taylor & Francis

  Background The aim of this study was to analyze the response of selected components of the immune system in rowers to maximal physical exercise, and to verify if this response could …

  201948 citations

• … of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic …

  ER Payne, M Aceves-Martins, J Dubost… - Nutrition …, 2025 - academic.oup.com

  … This meta-analysis provides evidence that theanine plus caffeine, and theanine alone, could be beneficial for cognitive and mood outcomes. More research using tea beverages or tea-…

  202514 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

  … The primary outcome of this meta‐analysis was the acute effect of a single oral dose of L-theanine on stress in healthy adults. Secondary outcomes encompassed both clinical and …

  2026

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2020-04-23. DSLD Label ID: 217124. 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.