L-Theanine 200 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.

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: 2 Capsule(s) · 1 per day

Not Present

• 

  Puritan's Pride Ashwagandha KSM-66 & L-Theanine

  Puritan's Pride4.4(43)

  $10.71
• 

  Puritan's Pride L-Theanine 200 mg per Serving 30 Capsules

  eBay - garage_sailer4.8(286)

  $9.00Lowest
• 

  Advance Physician Formulas L-theanine 200 Mg 60 Vegetable Capsules

  Walmart - iHerb4.7(130)

  $10.79
• 

  Sports Research L-Theanine Suntheanine Softgels

  Optimist4.7(1100)

  $36.00
• 

  Double Wood Supplements L-Theanine

  Target4.7(152)

  $19.95
• 

  Nature's Wonderland L-Theanine 200 mg Chewable Tablets

  Penn Herb Company

  $20.99
• 

  Pure Nutrition L Theanine Capsules

  eBay - jewels_hub_usa4.6(215)

  $23.27
• 

  Country Life L-Theanine 200 mg 60 Vegetarian Capsules

  Country Life Vitamins4.8(102)

  $30.29

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.

• GNC

  4.1 (34)

  Vitamin & supplements store

  5287 US-280 Suite 257, Birmingham, AL 35242

  Directions(205) 995-5121

• The Vitamin Shoppe

  4.4 (171)

  Vitamin & supplements store

  1713 Montgomery Hwy Ste 101, Birmingham, AL 35244

  Directions(205) 987-5328

• Sprouts Farmers Market

  4.6 (529)

  Vitamin & supplements store

  5265 US-280, Birmingham, AL 35242

  Directions(205) 263-2808

• Elite Nutrition

  4.9 (35)

  Nutritionist

  1841 Montgomery Hwy #101, Hoover, AL 35244

  Directions(205) 518-6744

• GNC

  4.0 (30)

  Vitamin & supplements store

  3036 Healthy Way E-7, Vestavia Hills, AL 35243

  Directions(205) 969-7984

• The Vitamin Shoppe

  4.5 (109)

  Vitamin & supplements store

  3220 Morrow Rd, Birmingham, AL 35235

  Directions(205) 661-0024

• GNC

  3.4 (57)

  Vitamin & supplements store

  4421 Creekside Ave SUITE 141, Hoover, AL 35244

  Directions(205) 982-0652

• GNC

  4.5 (33)

  Vitamin & supplements store

  5066 Pinnacle Sq Ste 120, Birmingham, AL 35235

  Directions(205) 655-7042

• Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials

  J Cotter, CE Caddick, JL Harper… - Nutritional …, 2025 - Taylor & Francis

  … beneficial effects of L-theanine supplementation on sleep-… 9 of the 11 that used a dose ≥200 mg/day (see Table 1 ). … using healthy adults in Japan, beneficial effects of L-theanine …

  20259 citations

• Theanine Capture of Reactive Carbonyl Species in Humans after Consuming Theanine Capsules or Green Tea

  Y Zhong, C Yang, Y Lu, L Lv - Journal of Agricultural and Food …, 2024 - ACS Publications

  … capsules (200 and 400 mg) or green tea (4 cups, containing 200 mg of … healthy volunteers and collect their urine samples within 24 h who consumed theanine capsules (200 or 400 mg) …

  20248 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

• Safety and Efficacy of AlphaWave®l-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo …

  M Moulin, DC Crowley, L Xiong, N Guthrie… - Neurology and …, 2024 - Springer

  … study that showed supplementation with l-theanine (200 mg/day) for four weeks in healthy adults significantly … Moreover, l-theanine supplementation (400 mg/day) for 17 days in …

  202427 citations

• A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave®l-Theanine on Stress in a Healthy Adult …

  M Evans, AC McDonald, L Xiong, DC Crowley… - Neurology and …, 2021 - Springer

  … , participants were administered a 200 mg single dose of AlphaWave ® l-Theanine, and the … Therefore, future research is warranted in long-term supplementation with l-theanine in the …

  202149 citations

• L-Theanine, the Magic of Green Tea

  A Snow - Prevention, 2021 - camdenwholehealth.com

  … Enter the natural supplement. Capsules of l-theanine at the 200 mg daily dose are available at Emerson Ecologics, and here at the pharmacy at Camden Whole Health. Ask your holistic …

  2021

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2023-06-22. DSLD Label ID: 286164. 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.