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 Vegetarian Capsule(s) · 1–4 per day

Not Present

• 

  Life Extension L-Theanine 100 mg 60 Capsules

  Vitacost.com4.8(1300)

  $18.00
• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Life Extension4.7(318)

  $17.24
• 

  Life Extension Theanine XR Stress Relief

  Walmart - Life Extension Buyers Club4.7(242)

  $21.00
• 

  Life Extension L-Theanine 100mg High Dose 60 Vegan Capsules

  GoSupps.com

  $79.99
• 

  Jarrow Formulas Theanine 100 mg 60 Capsules

  Life Extension4.8(1000)

  $13.49
• 

  up&up l-Theanine 100mg Capsules

  Target3.7(12)

  $6.59
• 

  Life Extension L-Theanine 100mg 60 Vegetarian Capsules - Mental Relaxation and Serenity

  GoSupps.com

  $99.99
• 

  Life Extension Enhanced Stress Relief 30 Capsules

  Walmart - Life Extension Buyers Club4.6(432)

  $21.00

Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.

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• Fitandfat

  5.0 (321)

  Vitamin & Supplements Shop

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

  Directions020 8050 1277

• Vitamin Shop Ealing

  4.4 (68)

  Vitamin & Supplements Shop

  197 Uxbridge Rd, London W13 9AA

  Directions020 8567 4573

• Vitamin Shop HOUNSLOW

  5.0 (265)

  Vitamin & Supplements Shop

  102 High St, Hounslow TW3 1NH

  Directions020 8616 4040

• Liberty Supplements Warehouse

  4.5 (29)

  Sports Nutrition Shop

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

  Directions020 8062 0480

• Planetis Natural Health & Nutrition

  5.0 (38)

  Vitamin & Supplements Shop

  32 Clifton Rd, London W9 1ST

  Directions020 7289 4551

• Body Hero

  5.0 (493)

  Sports Nutrition Shop

  1292 Greenford Rd, Greenford UB6 0HH

  Directions07502 448088

• Liberty Supplements

  4.5 (59)

  Sports Nutrition Shop

  344 High Rd, Wembley HA9 6AZ

  Directions020 3730 7317

• Supplemented

  4.7 (192)

  Vitamin & Supplements Shop

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

  Directions

• The effect of green tea amino acid L-theanine formulation on markers of stress and quality of sleep (THESleep project)–a study protocol for a pilot randomised control …

  A Bulman, A McKune, E Georgousopoulou… - Contemporary Clinical …, 2026 - Elsevier

  … Examining the effect of Ltheanine on sleep: a systematic review of dietary supplementation trials. Nutritional Neuroscience, 29(2), 224-238. https://doi.org/10.1080/1028415X.…

  2026

• l-Theanine extends lifespan of adult Caenorhabditis elegans

  K Zarse, S Jabin, M Ristow - European journal of nutrition, 2012 - Springer

  … To potentially support the ongoing search for compounds that may promote human health … that l-theanine is extending C. elegans lifespan at a wide range of concentration (ie from 100 …

  201256 citations

• Green tea elixir: Harnessing the healthful powers

  S Muthukrishnan, SY Jadhav, A Noor - Superfoods, 2026 - Elsevier

  … L-theanine an amino acid present in green tea has shown promise in the treatment of anxiety … This chapter's goal is to provide an overview about various health benefits, potential health …

  2026

• Suntheanine: A pure and safe L-theanine dietary supplement for relaxation and stress relief

  T Rao - suntheanine. com - academia.edu

  … functions of tea are attributed to the L-theanine (2). L-theanine was first discovered in green tea … In 1964, the Japanese Ministry of Health and Welfare approved L-theanine as a food …

• Effects of chamomile and L-theanine beverage on menstrual pain, menstrual symptoms, mood, and sleep quality in young women experiencing primary …

  Z Soh, SC Tan, TH Wong, ST Tan… - Journal of Food and …, 2025 - pmc.ncbi.nlm.nih.gov

  … [21] found that consuming a 200 mg l-theanine tablet … in healthy adults. Our study found that consuming a CTT beverage containing 480 mg chamomile extract and 200 mg l-theanine …

  2025

• L-theanine prevents acute alcoholic heart injury by regulating helper T cell balance and cardiac metabolites in mice

  SM Tan, JY Gu, XH Dang, JH Yang, KH Liu… - Food Science and …, 2025 - sciopen.com

  Acute alcohol consumption induces oxidative stress, triggers inflammation, and disrupts the immunity balance in the heart. L-theanine (LTA) possesses antioxidant, anti-inflammatory, …

  2025

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2016-05-22. DSLD Label ID: 59387. 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.