Smart Caffeine with L-Theanine

Suggested Use

Suggested Use: Take 1 capsule whenever focused energy is desired. Avoid use in the evening. Do not take more than 6 capsules per day.

• 

  Natural Stacks Smart Caffeine 60 Capsules

  iHerb4.7(271)

  $19.95
• 

  Natural Stacks Smart Caffeine 60 Veggie Caps

  Home & Well4.6(69)

  $21.00
• 

  NaturalStacks.com NEUROFUEL Nootropic Smart Caffeine Stack

  Natural Stacks4.9(76)

  $50.91
• 

  Nutricost Caffeine + L-Theanine Capsules

  Target4.7(927)

  $13.95
• 

  Natural Stacks Neuro Fuel

  Walmart - Natural Stacks4.8(644)

  $23.70
• 

  Natural Stacks Neuro Fuel 45 Veggie Caps

  Instacart

  $44.99
• 

  Sports Research L-Theanine & Caffeine Softgels

  Target4.8(265)

  $24.45
• 

  Wilderness Athlete Energy Focus Tub

  Wilderness Athlete4.5(15)

  $49.95

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• The Vitamin Shoppe

  4.5 (143)

  Vitamin & supplements store

  NW corner of 55th & 8th, 931 8th Ave, New York, NY 10019

  Directions(212) 582-8965

• GNC

  4.7 (197)

  Vitamin & supplements store

  2 Pennsylvania Plaza Ste 29B, New York, NY 10121

  Directions(212) 239-1251

• GNC

  4.4 (88)

  Vitamin & supplements store

  753 Broadway Spc 753, New York, NY 10003

  Directions(212) 380-5999

• The Vitamin Shoppe

  4.3 (163)

  Vitamin & supplements store

  385 5th Ave, New York, NY 10016

  Directions(212) 532-4534

• GNC

  3.8 (63)

  Vitamin & supplements store

  600 8th Ave, New York, NY 10018

  Directions(212) 768-7468

• The Vitamin Shoppe

  4.4 (98)

  Vitamin & supplements store

  257 8th Ave, New York, NY 10011

  Directions(212) 243-0086

• GNC

  4.0 (145)

  Vitamin & supplements store

  1755 Broadway, New York, NY 10019

  Directions(212) 247-2309

• The Vitamin Shoppe

  4.3 (70)

  Vitamin & supplements store

  2086-A Broadway, New York, NY 10023

  Directions(212) 580-7620

• A Standardized Single Dose of the Nootropic CILTEP® Has No Effect on Cognitive Performance in Healthy Elderly Participants

  N Possemis, S Caldenhove, J Prickaerts… - Journal of Cognitive …, 2025 - Springer

  … of caffeine, l-theanine, vinpocetine, l-tyrosine, and vitamins B6 and B12 (CAF +). In healthy … a requirement of the sponsor of this study (Natural Stacks™). Also, the standardized dose is …

  2025

• Anti-stress, behavioural and magnetoencephalography effects of an L-theanine-based nutrient drink: a randomised, double-blind, placebo-controlled …

  DJ White, S De Klerk, W Woods, S Gondalia, C Noonan… - Nutrients, 2016 - mdpi.com

  … with caffeine administration (250 mg). Haskell et al. [26] also studied l-theanine and caffeine … support of cognitive or mood effects of l-theanine in isolation. The combined treatment was …

  2016177 citations

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

  HMDLT Cost - nootropicology.com

  … Taking L-Theanine alongside caffeine has significantly enhanced my focus and calmness. The combination provides a smooth energy boost without the jitters typically associated with …

• 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

  … Theanine maintains sleep quality in healthy young women by suppressing the increase in caffeine-induced wakefulness after sleep onset [10.1039/D3FO01247F]. Food & Function, …

  2026

• Living the Raw Live Vegan Lifestyle: Finally Eat More and Lose More Weight with Optimal Nutrition!

  SE Rubarth - 2012 - books.google.com

  … half the caffeine of coffee. Its L‑theanine neutralizes the harmful side effects of caffeine and is … So I will buy that pineapple, which is not grown in Nova Scotia, and enjoy it! Fruits contain a …

  20121 citations

• Electronic sensor technologies in monitoring quality of tea: A review

  SMT Gharibzahedi, FJ Barba, J Zhou, M Wang… - Biosensors, 2022 - mdpi.com

  … [12] also determined this health effect in green tea, due to the presence of the main component of amino acids, namely L-theanine. Ma et al. [13] recently found that black tea …

  202273 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2022-09-22. DSLD Label ID: 274259. 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.