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Caffeine + L-Theanine

product on market Softgel Capsule SmarterVitamins Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 40% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

Caffeine and L-theanine are combined to support alertness and focus, with strong evidence suggesting they work synergistically to reduce caffeine-induced anxiety. Medium chain triglycerides provide a source of quick energy. Research on this specific combination is moderate to strong regarding cognitive performance.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Caffeine + L-Theanine
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Softgel(s)
Serving Size
50
Servings
Other Combinations
Product Type
40%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Calories
5 Calorie(s)
Total Fat
0.5 Gram(s) (1% DV)
Medium Chain Triglycerides
500 mg
200 mg
Market median: 180.0mg (239 products) 49 studies (A:1, B:19)
100 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)

Other Ingredients

Softgel Capsule Beeswax Sunflower Lecithin
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: As a dietary supplement, take one softgel daily with or without food. Do not consume more than 3 softgels per day.

Warnings & Precautions

Caution: As with any dietary supplement, consult your healthcare practitioner before using this or any other product if you are pregnant, nursing, trying to conceive, taking medication or have a medical condition.

Keep out of reach of children.

Do not use if sensitive to caffeine.

Formulation Notes

Caffeine is found in coffee and helps by providing energizing effects and wakefulness MCT's are fast acting sources of energy from coconuts L-theamine neutralizes the jittery effects of caffeine without reducing its mind-energizing, fat-burning features

Energy + Focus

Made with MCT oil

Additional Information

Cleaner. Better. Smarter.

Store in a cool, dry place away from heat and light.

Metadata

Product Details

UPC / SKUX001U9SG93
DSLD Entry Date2021-02-25
Product TypeOther Combinations
FormSoftgel Capsule
BrandSmarterVitamins
DSLD ID243846
Data Updated2026-04-11
Research

Research Evidence

37
Research Sources
53
Avg Quality
22
Rct
10
Systematic Review
3
Meta Analysis
1
Clinical Trial
1
Openfda Safety
B Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials
Systematic Review Nutritional neuroscience 2026 PubMed DOI
B The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
Meta Analysis Sleep medicine reviews 2025 PubMed DOI
B The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
Rct Nutritional neuroscience 2010 PubMed DOI
B Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
Rct Nutrients 2019 PubMed DOI
B The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review
Systematic Review International journal of molecular sciences 2023 PubMed DOI
B Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Meta Analysis Nutrition reviews 2025 PubMed DOI
B Effect of Alpha-S1-Casein Tryptic Hydrolysate and L-Theanine on Poor Sleep Quality: A Double Blind, Randomized Placebo-Controlled Crossover Trial
Rct Nutrients 2022 PubMed DOI
B Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study
Rct Nutritional neuroscience 2025 PubMed DOI
B The combined effects of L-theanine and caffeine on cognitive performance and mood
Rct Nutritional neuroscience 2008 PubMed DOI
B Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis
Meta Analysis Nutrition reviews 2014 PubMed DOI
View all evidence for L Theanine →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.