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: 1 Capsule(s) · 1 per day

Not Present

• 

  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.