L-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.

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) · 2–3 per day

Not Present

• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Supplement First4.7(313)

  $60.99
• 

  Enzymatic Therapy L-Theanine, 100 Mg, Veg Capsules At Hy-Vee

  Hy-Vee4.7(313)

  $15.99
• 

  Nature Made Chewable L Theanine Tablets

  Target4.4(59)

  $16.99
• 

  MaryRuth's L-Theanine Liquid Drops

  The Vitamin Shoppe4.8(223)

  $22.99
• 

  Nutricost L-Theanine Capsules

  Walmart4.8(6900)

  $5.88
• 

  Now Foods L-Theanine 60 Capsules

  Muscle & Strength4.7(7600)

  $14.99
• 

  Natural Factors L-Theanine Suntheanine Stress-Relax

  PureFormulas.com4.8(1100)

  $18.87
• 

  Sports Research L-Theanine Suntheanine Softgels

  Walmart - Sports Research4.7(1000)

  $13.96

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 Vitamin Shoppe

  4.1 (51)

  Vitamin & supplements store

  239 Whiting Farms Rd, Holyoke, MA 01040

  Directions(413) 538-4775

• Absolute Nutrition Center

  5.0 (35)

  Vitamin & supplements store

  1485 Memorial Dr, Chicopee, MA 01020

  Directions(413) 535-1111

• CVS

  3.5 (72)

  Vitamin & supplements store

  90 Main St, Northampton, MA 01060

  Directions(413) 584-2580

• GNC

  4.1 (50)

  Vitamin & supplements store

  935 Riverdale St SPACE F-109, West Springfield, MA 01089

  Directions(413) 747-5392

• The Vitamin Shoppe

  4.2 (87)

  Vitamin & supplements store

  103 Elm St, Enfield, CT 06082

  Directions(860) 253-9082

• Cornucopia Natural Wellness Market

  4.6 (68)

  Vitamin & supplements store

  The Wauregan Building, 384-A Dwight St, Holyoke, MA 01040

  Directions(413) 586-3800

• BanditsDad1Media

  5.0 (1)

  Vitamin & supplements store

  351 Pleasant St STE B, Northampton, MA 01060

  Directions(413) 320-0192

• Deals & Steals Natural Foods

  4.4 (369)

  Health food store

  1 Pearl St, Northampton, MA 01060

  Directions(413) 586-5654

• L-Theanine: An astounding sui generis integrant in tea

  E Sharma, R Joshi, A Gulati - Food chemistry, 2018 - Elsevier

  … l-theanine (l-Th), a non-protein amino acid present in tea, is a valuable nutraceutical product with unique health benefits and used as an additive in food industry. l-Th enhances the …

  2018137 citations

• Multisystem pathology in chronic variable stress: gut–liver–brain axis disruption and the therapeutic promise of magnesium-L-theanine

  K Sahin, G Erek - Therapeutic Advances in Endocrinology …, 2026 - journals.sagepub.com

  2026

• The Emerging Role of Citrulline and Theanine in Health and Disease: A Comprehensive Review

  X Lv, C Chen, Y Liang, Y Song, J Liu, W Chen, H Li - Nutrients, 2025 - mdpi.com

  … Among non-proteinogenic amino acids, L-citrulline and L-theanine were selected for this review due to their unique metabolic pathways, dietary availability, and growing research …

  20254 citations

• L-theanine: A potential multifaceted natural bioactive amide as health supplement

  R Adhikary, V Mandal - Asian Pacific Journal of Tropical Biomedicine, 2017 - Elsevier

  … in modern therapeutics, which are used to prepare antibiotics, growth supplements or some other therapeutics. l-theanine is such a bioactive amide amino acid presented in different …

  201778 citations

• Magnesium-L-theanine complex protects against liver and intestinal damage caused by chronic variable stress

  K Sahin, M Yabas, C Orhan, B Er, R Ozmen… - British Journal of …, 2026 - cambridge.org

  … Chronic stress can lead to serious health problems, including elevated … enzyme activity and hepatic steatosis. Here, we investigate the protective effects of the magnesium-L-theanine (…

  20261 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. …

  202525 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2013-08-23. DSLD Label ID: 25290. 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.