L-Theanine + Caffeine

Suggested Use

Suggested use: Adults take 1 softgel daily with food; or as recommended by a qualified healthcare professional.

• 

  Sports Research L-Theanine & Caffeine Softgels

  iHerb4.8(265)

  $22.97
• 

  Sports Research L-Theanine Suntheanine Softgels

  Sports Research4.7(1000)

  $38.95
• 

  Sports Research Methyl Folate + B12-1000 mcg L-Methylfolate & 2000 mcg Methylcobalamin for Cellular Energy Support

  Sports Research

  $22.95
• 

  Sports Research Sleep Complex Melatonin-Free 60 Veggie Capsules

  Sports Research3.9(57)

  $26.95
• 

  Sports Research Collagen Peptides

  Sports Research4.7(3900)

  $30.95
• 

  L-Theanine Pro

  ChiropracticOutfitters.com

  $31.00
• 

  Legion Peak Caffeine and L-Theanine Supplement

  Target4.7(43)

  $29.99
• 

  L-Theanine + Caffeine Softgels

  eBay

  $32.13

Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.

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• H CLUB

  5.0 (92)

  Vitamin & supplements store

  808 S Vermont Ave, Los Angeles, CA 90005

  Directions(213) 306-0297

• Nature A Nutrition

  4.5 (2)

  Health food store

  928 S Western Ave #201, Los Angeles, CA 90006

  Directions(213) 739-8874

• N101

  5.0 (419)

  Vitamin & supplements store

  6252 Romaine St, Los Angeles, CA 90038

  Directions(323) 467-6123

• GNC

  4.1 (30)

  Vitamin & supplements store

  4550 W Pico Blvd Ste C304, Los Angeles, CA 90019

  Directions(323) 549-9415

• Vit-Al Supplements

  Vitamin & supplements store

  2607 Brighton Ave, Los Angeles, CA 90018

  Directions

• The Vitamin Shoppe

  4.4 (246)

  Vitamin & supplements store

  101 N Fairfax Ave, Los Angeles, CA 90036

  Directions(323) 936-6839

• Healthy Protein Nutrition

  5.0 (34)

  Vitamin & supplements store

  1214 Venice Blvd., Los Angeles, CA 90006

  Directions(714) 333-8043

• Peter Gillham's Nutrition Center

  4.3 (16)

  Vitamin & supplements store

  4873 Fountain Ave, Los Angeles, CA 90029

  Directions(323) 667-1894

• Performance-enhancing effects of caffeine and L-Theanine among Iranian elite wrestlers: a focus on cognitive and specific physical performance

  R Razazan, M Hemmatinafar, B Imanian… - … Society of Sports …, 2025 - Taylor & Francis

  … L-theanine, a non-stimulant amino acid found in tea, may help mitigate these effects by … This study aimed to investigate the acute effects of caffeine, L-theanine, and their combination on …

  20257 citations

• Effects of acute caffeine, theanine and tyrosine supplementation on mental and physical performance in athletes

  J Zaragoza, G Tinsley, S Urbina, K Villa… - … Society of Sports …, 2019 - Taylor & Francis

  … the lack of information in athletic individuals, the purpose of this investigation was to determine whether the acute ingestion of a supplement containing caffeine, theanine and tyrosine …

  201949 citations

• Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized …

  SY Tuncer, S Ozdenk, UC Yildirim, D Erkan… - Frontiers in …, 2026 - frontiersin.org

  … and cognitive performance in athletic populations. This … , this study examined the effects of acute L-theanine, caffeine or … of our study is that acute ingestion of 200 mg L-theanine was …

  20261 citations

• … single or combined caffeine and L-Theanine supplementation on shooting and cognitive performance in elite curling athletes: a double-blind, placebo-controlled study

  U Yilmaz, Y Buzdagli, ML Polat, Y Bakir… - … Society of Sports …, 2023 - Taylor & Francis

  … In various studies, caffeine has been reported to have positive effects on response times in … mental sports might benefit from these impacts. Caffeine consumption in the current study led …

  202324 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

  … study looked into the visual stimulus discrimination and neural activity after the administration of 200mg of l-theanine, 160mg of caffeine, their … Both l-theanine and l-theanine-caffeine …

  20242 citations

• Synergistic Effects of Caffeine, L-theanine, and Diaphragmatic Breathing on Esports Performance: A Randomized Controlled Crossover Trial

  S Arslan, B Akçay, OB Türkmen, EK Mutlu - Nutrition Research, 2026 - Elsevier

  … on sports performance in e-athletes. In the current study, a significant improvement in sports … The findings of this study suggest that caffeine, L-theanine, and diaphragmatic breathing …

  2026

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2024-07-25. DSLD Label ID: 310543. 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.