L-Theanine 100 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 L-Theanine 100mg 90 Veg Capsules

  iHerb4.8(2600)

  $13.46
• 

  Now Foods L-Theanine 100mg Chewables

  Target4.7(727)

  $17.99
• 

  NOW Foods L-Theanine 100 mg Chewables

  NOW5.0(1)

  $23.99
• 

  (2 pack) NOW Foods Chewable L-Theanine , 100 mg, 90 Chewables, Size: 3.50, White

  Walmart - Fruitful Yield5.0(1)

  $31.44
• 

  NOW L-Theanine, 100 mg, Veg Capsules

  Mercato.com4.8(2600)

  $0.17Lowest
• 

  Now Foods L-Theanine 60 Capsules

  Target4.7(7600)

  $18.99
• 

  Now Foods L-Theanine 100 mg - 120 Veg Capsules

  Medpak | Healthy Choice4.8(2600)

  $15.00
• 

  NOW L-Theanine 100 mg Veg Capsules

  The Food Mill4.8(2600)

  $14.02

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 (48)

  Vitamin & supplements store

  12718 Jefferson Davis Hgwy, Chester, VA 23831

  Directions(804) 751-9204

• HERBALIFE JEFFERSON NUTRITION

  5.0 (4)

  Vitamin & supplements store

  9657 Rte 1, Richmond, VA 23237

  Directions(804) 920-1125

• The Vitamin Shoppe

  4.6 (153)

  Vitamin & supplements store

  11440 Midlothian Turnpike Ste A, Richmond, VA 23235

  Directions(804) 379-6259

• No Limits Nutrition Center

  4.9 (314)

  Vitamin & supplements store

  1311 W Broad St, Richmond, VA 23220

  Directions(804) 714-7422

• The Vitamin Shoppe

  4.4 (28)

  Vitamin & supplements store

  15600 Hull St, Chesterfield, VA 23832

  Directions(804) 802-0552

• The Vitamin Shoppe

  4.5 (149)

  Vitamin & supplements store

  5701 W Broad St, Richmond, VA 23230

  Directions(804) 282-1867

• GNC

  4.4 (37)

  Vitamin & supplements store

  1601 Willow Lawn Dr SPACE 235, Richmond, VA 23230

  Directions(804) 282-7456

• The Vitamin Shoppe

  4.7 (101)

  Vitamin & supplements store

  11301 W Broad St Bldg B Suite 101, Glen Allen, VA 23060

  Directions(804) 360-2456

• Kinetics of L-theanine uptake and metabolism in healthy participants are comparable after ingestion of L-theanine via capsules and green tea

  L Scheid, S Ellinger, B Alteheld, H Herholz… - The Journal of …, 2012 - academic.oup.com

  … Therefore, L-theanine is available as a supplement and is now … L-theanine is rapidly absorbed in healthy participants after intake of capsules and green tea. The major part of L-theanine …

  201296 citations

• L-theanine as a promising agent on brain health-promoting foods–A review

  Q Wang, Y Zheng, CT Ho, J Huang, X Guan… - Journal of Food …, 2021 - isnff-jfb.com

  … Meanwhile, with development of massiveproduction technology of L-theanine, it is now commercially produced at decreasing cost in the factories through biological transformation, …

  20214 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: 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

• L-Theanine Nootropic Review: Benefits, Side Effects & Dosage

  HMDLT Cost - nootropicology.com

  … For healthy individuals, L-Theanine offers cognitive benefits … Reputable brands like NOW Foods, Jarrow Formulas, and … can help users optimize their L-Theanine supplementation. …

• Improvement of both human and animal memory by synergy between fructooligosaccharide and L‐theanine function establishing a safe and effective food supplement

  Y Li, Y Jiang, Z Zhang, VIP Loake, X Bao… - Food science & …, 2024 - Wiley Online Library

  … healthy adults after 1 month of consumption. Our results suggest that a combination of FOS and L-theanine … Emerging data now suggest that the gut microbiota can regulate the activity …

  202412 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2015-12-23. DSLD Label ID: 55128. 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.