L-Theanine 200 mg

Suggested Use

Suggested use: As a dietary supplement; take 1 capsule daily; or as directed by your healthcare practitioner.

• 

  DaVinci Labs L-Theanine 120 Capsules

  iHerb4.8(55)

  $80.20
• 

  DaVinci Laboratories Liposomal L-Theanine

  Target4.7(61)

  $46.46
• 

  Little DaVinci Calm Citrate Powder

  DaVinci Labs4.2(20)

  $46.46
• 

  DaVinci Labs Sleep Benefits 60 Capsules

  DaVinci Labs4.6(17)

  $58.50
• 

  DaVinci Labs Sleep Complete Dietary Supplement

  Target4.2(6)

  $58.50
• 

  L-Theanine 200 mg 90 capsules

  Walmart - Pattern

  $54.00
• 

  L-THEANINE 200 capsules

  NutriKey4.8(27)

  $21.50
• 

  Advance Physician Formulas L-theanine 200 Mg 60 Vegetable Capsules

  iHerb4.7(127)

  $9.38

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

  4.4 (128)

  Vitamin & supplements store

  2408 W Memorial Rd, Oklahoma City, OK 73134

  Directions(405) 302-4850

• GNC

  4.2 (52)

  Vitamin & supplements store

  1901 Northwest Expy Ste 1889 SPACE 2071, Oklahoma City, OK 73118

  Directions(405) 418-5001

• Triad Fitness+Supplements+Nutrition - Quail Springs

  5.0 (228)

  Vitamin & supplements store

  14201 N May Ave #203, Oklahoma City, OK 73134

  Directions(405) 749-4542

• Gallion Sports Nutrition

  5.0 (41)

  Vitamin & supplements store

  15220 N Western Ave Ste G, Edmond, OK 73013

  Directions(405) 216-3267

• Supplement World

  4.8 (246)

  Vitamin & supplements store

  820 SW 89th St, Oklahoma City, OK 73139

  Directions(405) 982-5949

• GNC

  4.2 (37)

  Vitamin & supplements store

  6957 Northwest Expy, Oklahoma City, OK 73132

  Directions(405) 721-0844

• GNC

  3.2 (9)

  Vitamin & supplements store

  2300 W Memorial Rd Space #2, Oklahoma City, OK 73134

  Directions(405) 849-5356

• GNC

  3.4 (26)

  Vitamin & supplements store

  1508 E 2nd St, Edmond, OK 73034

  Directions(405) 359-7835

• Zen Sleep

  HI Works - curatedwellness.com

  … a calm, relaxed state and promotes healthy sleep patterns by … L-Theanine (200 mg): A non-protein amino acid derived from … Zen Sleep provides research-informed doses of L-theanine …

• 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

• The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic review

  R Moshfeghinia, E Sanaei, S Mostafavi, K Assadian… - BMC psychiatry, 2024 - Springer

  … the effects of LT supplementation on the outcomes of patients with mental health disorders. The … LT dosages varied, including 400 mg/day (200 mg × 2 times/day) in two studies added to …

  202422 citations

• Benefits of l-theanine supplementation and its possible role in clinical use–review

  K Womperski, J Woźniak, J Szymonik, S Szopa… - Quality in Sport, 2024 - apcz.umk.pl

  … One of them – l-theanine - seems to have a multidirectional influence on human health. … [10] White DJ et al. reports that administration of 200 mg of l-theanine lowers the subjective …

  20242 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 …

  202423 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) …

  20245 citations

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: 288299. 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.