Double Strength 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.

Serving Size: 1 Veg Capsule(s) · 1–2 per day

Not Present

• 

  Now Foods L-Theanine Double Strength 200mg 120 Veg Capsules

  Walmart - Fruitful Yield4.7(6700)

  $29.98
• 

  Now Foods L-Theanine Double Strength 200 mg

  NOW4.7(6600)

  $25.99
• 

  Now Foods L-Theanine 60 Capsules

  HealthPost.co.nz4.7(1300)

  $22.27
• 

  NOW Foods L-Theanine Double Strength 200 mg Per Cap 180 Veg Capsules

  Walmart - Green Valley Health Market LLC

  $29.97
• 

  Now Foods L-Theanine 200mg 90 VegCaps

  Natures Food Markets4.7(49)

  $26.99
• 

  (2 pack) NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules

  Walmart4.7(6600)

  $40.54
• 

  NOW L-Theanine 200mg 60 Veggie Caps

  Vitamart.ca4.0(16)

  $19.13
• 

  Now Foods L-Theanine 200 Mg - 2 x 120 Veg Capsule Bottles TWINPACK

  DPS Nutrition4.7(6700)

  $45.98

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• Nutrition Depot

  5.0 (112)

  Vitamin & supplements store

  2005 Southwest Fwy, Houston, TX 77098

  Directions(346) 516-0878

• Supplement Superstore

  5.0 (1306)

  Vitamin & supplements store

  7449 S Lindbergh Blvd, St. Louis, MO 63125

  Directions(314) 416-8800

• Supplement Warehouse

  4.7 (229)

  Vitamin & supplements store

  181 W Crossroads Pkwy Ste F, Bolingbrook, IL 60440

  Directions(630) 965-8526

• Capitol Nutrition & Supplements

  4.9 (204)

  Vitamin & supplements store

  7030 W 159th St, Orland Park, IL 60462

  Directions(708) 444-2114

• Supplement Superstore

  5.0 (1144)

  Vitamin & supplements store

  14004 Manchester Rd #4514, Ballwin, MO 63011

  Directions(636) 391-1085

• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• Supplement Superstore

  5.0 (734)

  Vitamin & supplements store

  2090 Washington Crossing, Washington, MO 63090

  Directions(636) 432-1880

• Supplement Superstore

  4.8 (132)

  Vitamin & supplements store

  8600 Ward Pkwy Ste 2140, Kansas City, MO 64114

  Directions(816) 326-7155

• 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

• 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

  … - seems to have a multidirectional influence on human health… , after four weeks of 200mg/day l-theanine ingestion. SDS … reports that administration of 200 mg of l-theanine lowers the …

  20242 citations

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

  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

• The effect of green tea amino acid L-theanine formulation on markers of stress and quality of sleep (THESleep project)–a study protocol for a pilot randomised control …

  A Bulman, A McKune, E Georgousopoulou… - Contemporary Clinical …, 2026 - Elsevier

  … continuing to grow with these studies now being the subject of … questionnaire and general health questionnaire to determine if … on sleep: a systematic review of dietary supplementation …

  2026

• L-Theanine and Caffeine Stack: 4 Ratios Ranked by Clinical Evidence (2026)

  K Andrews - noobru.com

  … The 2:1 ratio (200 mg L-theanine to 100 mg caffeine) is the most commonly used in clinical trials and … Always consult your healthcare provider before starting any supplement regimen. …

• 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

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2021-03-25. DSLD Label ID: 244409. 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.