L-Theanine

Suggested Use

Recommendation: Take 1 capsule up to three times daily. For maximum support; take 2 capsules three times daily.

• 

  Enzymatic Therapy L-Theanine 180 Veg Capsules

  Supplement First4.7(313)

  $60.99
• 

  Nature Made Chewable L Theanine Tablets

  Target4.4(59)

  $15.79
• 

  MaryRuth's L-Theanine Liquid Drops

  The Vitamin Shoppe4.8(223)

  $22.99
• 

  up&up l-Theanine 100mg Capsules

  Target3.7(12)

  $6.59
• 

  Nutricost L-Theanine Capsules

  Walmart4.8(6900)

  $5.88
• 

  Walgreens L-Theanine 200 mg Capsules (60 ct)

  Walgreens.com4.0(4)

  $14.99
• 

  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

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

  4.5 (189)

  Vitamin & supplements store

  438 Northwest Loop 410 #107, San Antonio, TX 78216

  Directions(210) 541-6749

• Rock's Discount Vitamins - San Antonio Austin Hwy

  5.0 (282)

  Vitamin & supplements store

  1248 Austin Hwy #204, San Antonio, TX 78209

  Directions(210) 826-2500

• GNC

  4.7 (95)

  Vitamin & supplements store

  260 E Basse Rd Bldg 1, San Antonio, TX 78209

  Directions(210) 832-9211

• Cost Plus Nutrition - Vineyard

  4.9 (144)

  Vitamin & supplements store

  1201 N Loop 1604 W #116, San Antonio, TX 78232

  Directions(210) 366-2520

• Revive Nutrition of Texas

  5.0 (217)

  Vitamin & supplements store

  7431 Northwest Loop 410 #114, San Antonio, TX 78251

  Directions(210) 420-7131

• Strong Supplements & Nutrition

  4.8 (75)

  Vitamin & supplements store

  17910 Bulverde Rd Ste 111, San Antonio, TX 78259

  Directions(210) 600-4202

• Rock's Discount Vitamins - San Antonio Blanco

  4.9 (261)

  Vitamin & supplements store

  7115 Blanco Rd #105, San Antonio, TX 78216

  Directions(210) 342-7625

• The Vitamin Shoppe

  4.6 (112)

  Vitamin & supplements store

  1803 N Loop 1604 E Suite 2, San Antonio, TX 78232

  Directions(210) 491-4311

• 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 2016-03-24. DSLD Label ID: 58060. 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.