L-Theanine 200 mg

Suggested Use

Directions: For adults; take two (2) capsules daily; preferably on an empty stomach.

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  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.