Pure 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: 250 mg · 1–3 per day

Based on 2,000 calorie diet

• 

  Micro Ingredients Pure L-Theanine Powder

  Micro Ingredients3.8(54)

  $24.95
• 

  Micro Ingredients L-Theanine Softgels

  Target4.8(18)

  $32.99
• 

  Micro Ingredients L-Theanine + Magnesium Glycinate Softgels

  Walmart - Micro Ingredients4.8(740)

  $24.95
• 

  Micro Ingredients Caffeine 200mg + L-Theanine 200mg Softgels

  Micro Ingredients

  $23.99
• 

  Pure L-theanine Powder, 100 Grams (1 Year Supply), Filler Free, No

  eBay - supp-delight3.8(54)

  $28.99
• 

  Now Foods L-Theanine 60 Capsules

  iHerb4.7(1300)

  $15.91
• 

  up&up l-Theanine 100mg Capsules

  Target3.7(12)

  $6.59
• 

  MaryRuth's L-Theanine Liquid Drops

  Vitacost.com4.8(247)

  $21.95

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.

• Pure Nutrition

  4.9 (87)

  Vitamin & supplements store

  9496 Magnolia Ave Ste 102, Riverside, CA 92503

  Directions(951) 729-5724

• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• Simply Potent

  5.0 (1)

  Vitamin & supplements store

  2906 Payson St, Houston, TX 77021

  Directions

• PureFormulas

  4.7 (1088)

  Vitamin & supplements store

  11800 NW 102nd Rd #2, Medley, FL 33178

  Directions(800) 383-6008

• Supplement Superstores

  5.0 (1204)

  Vitamin & supplements store

  7344 W 135th St, Overland Park, KS 66223

  Directions(913) 402-6813

• Pure Essentials Supplements

  5.0 (1)

  Vitamin & supplements store

  121 Varick St, New York, NY 10013

  Directions(212) 758-3200

• Potent Health Supplements

  3.0 (2)

  Wholesaler

  10917 Fullerton Dr, Houston, TX 77043

  Directions(713) 409-7041

• PureBulk, Inc.

  4.7 (303)

  Vitamin & supplements store

  1640 Austin Rd, Roseburg, OR 97471

  Directions(541) 679-1500

• 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

  … of L-theanine uptake and metabolism in healthy participants are comparable after ingestion of L-theanine via … Effect of L-theanine on sensorimotor gating in healthy human subjects. …

  201678 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. …

  202526 citations

• 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 …

  2018136 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

• Physicochemical, antioxidant and sensory properties of Mango Sorbet containing L-theanine as a potential functional food product

  J Williams, NM D'Cunha, J Kellett… - Journal of Food Science …, 2022 - Springer

  … The non-proteinous amino acid L-theanine (L-THE) is associated with a range of health benefits including improvements in immune function, cardiovascular outcomes and cognition. …

  20229 citations

• The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis

  A Bulman, NM D'Cunha, W Marx, M Turner… - … medicine reviews, 2025 - Elsevier

  … This systematic review ansd meta-analysis aimed to evaluate the effects of L-theanine, a non-… of L-theanine supplementation on sleep quality in humans of all ages and health status …

  202535 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2021-09-24. DSLD Label ID: 256701. 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.