L-Theanine + Caffeine®

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 Softgel(s) · 1–2 per day

Percent Daily Values are based on a 2,000 calorie diet.

• 

  Sports Research L-Theanine & Caffeine Softgels

  Sports Research4.8(277)

  $22.95
• 

  Sports Research L-Theanine Suntheanine Softgels

  Sports Research4.7(1100)

  $38.95
• 

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

  Sports Research

  $22.95
• 

  Vitamatic L-Theanine 200mg Caffeine 100mg 120 Tablets

  Target4.4(93)

  $16.99
• 

  Nutricost Caffeine + L-Theanine Capsules

  Nutricost4.7(1100)

  $8.97Lowest
• 

  Sports Research Sleep Complex Melatonin-Free 60 Veggie Capsules

  Sports Research4.0(62)

  $26.95
• 

  L-Theanine Pro

  ChiropracticOutfitters.com

  $31.00
• 

  Nootropics Depot L-Theanine Capsules

  Nootropics Depot4.5(15)

  $44.99

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.

• Love Life Supplements

  4.8 (87)

  Vitamin & Supplements Shop

  wellington house, East Rd, Petersfield, Cambridge CB1 1BH

  Directions0800 122 3351

• Protein World

  3.7 (124)

  Vitamin & Supplements Shop

  Protein world, Restmor Way, Hackbridge, Wallington SM6 7AH

  Directions

• RightNutri

  4.9 (78)

  Vitamin & Supplements Shop

  26 Queenstown Rd, London SW8 3RX

  Directions0800 098 8888

• Nayble Health & Sports

  5.0 (139)

  Vitamin & Supplements Shop

  18 Chamberlayne Rd, London NW10 3JD

  Directions020 7625 5111

• ITL Health

  5.0 (37)

  Vitamin & Supplements Shop

  50 Broadway, London SW1H 0BL

  Directions0118 321 7628

• Fitandfat

  5.0 (321)

  Vitamin & Supplements Shop

  Inside the post office, 187 Uxbridge Rd, London W13 9AJ

  Directions020 8050 1277

• LA Muscle UK

  4.8 (914)

  Vitamin & Supplements Shop

  Oliver business park, London NW10 7XW

  Directions020 8965 1177

• London Supplements

  3.7 (84)

  Vitamin & Supplements Shop

  13, Waverley Industrial Park Waverley Industrial Estate, Hailsham Dr, Harrow HA1 4TR

  Directions020 8863 0300

• 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 …

  202327 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.