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 Laboratories, L-теанин, 200 мг, 60 капсул

  iHerb4.8(32)

  $48.44
• 

  DaVinci Labs L-Theanine 120 Capsules

  DaVinci Labs4.8(31)

  $80.20
• 

  DaVinci Labs Liposomal L-Theanine

  Target4.7(65)

  $46.46
• 

  DaVinci Neuro Benefits 90 Capsules

  DaVinci Labs4.3(3)

  $64.70
• 

  DaVinci Labs Sleep Benefits 60 Capsules

  iHerb4.5(24)

  $58.50
• 

  L-Theanine 120

  drguberman.com

  $80.20
• 

  Nootropics Depot L-Theanine Capsules

  Nootropics Depot4.5(15)

  $15.99
• 

  DaVinci Labs Sleep Complete Dietary Supplement

  DaVinci Labs4.2(6)

  $58.50

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 (110)

  Vitamin & supplements store

  7040 S Rainbow Blvd #100, Las Vegas, NV 89113

  Directions(702) 534-1663

• GNC

  4.2 (51)

  Vitamin & supplements store

  4055 S Maryland Pkwy #4010, Las Vegas, NV 89119

  Directions(702) 866-0628

• Vitamin World

  3.0 (11)

  Vitamin & supplements store

  Premium Outlet, 7400 S Las Vegas Blvd, Las Vegas, NV 89123

  Directions(702) 896-1053

• Vegas Discount Nutrition

  5.0 (2002)

  Vitamin & supplements store

  4180 S Grand Canyon Dr, Las Vegas, NV 89147

  Directions(702) 220-4060

• Vegas Discount Nutrition

  5.0 (487)

  Vitamin & supplements store

  4965 Blue Diamond Rd #110, Las Vegas, NV 89139

  Directions(725) 251-3265

• The Vitamin Shoppe

  4.7 (120)

  Vitamin & supplements store

  Pad J, 8820 W Charleston Blvd #102, Las Vegas, NV 89117

  Directions(702) 586-3671

• GNC

  4.1 (49)

  Vitamin & supplements store

  4150 NV-160 Spc #109, Las Vegas, NV 89139

  Directions(702) 361-3877

• Vegas Discount Nutrition

  4.9 (2012)

  Vitamin & supplements store

  9680 S Eastern Ave #120, Las Vegas, NV 89123

  Directions(702) 617-3586

• 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

• 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 …

  202425 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 …

  202427 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

• 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 …

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2024-02-22. DSLD Label ID: 305233. 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.