Home/ Supplements/ L Theanine/ L-Theanine & Caffeine

L-Theanine & Caffeine

product on market Capsule Nutriana Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 100% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · grounded in 1 source · methodology

L-theanine and caffeine are supported by strong evidence for improving attention and cognitive performance when taken together. Research indicates that L-theanine may mitigate the jittery effects of caffeine while enhancing alertness. This combination is widely studied for its synergistic impact on focus and mental clarity.

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

Label

Product Label

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

Label Data

1 Capsule(s)
Serving Size
60
Servings
Non-Nutrient/Non-Botanical
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)
Market median: 180.0mg (239 products) 49 studies (A:1, B:19)

Other Ingredients

Gelatin Rice Flour Silica
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested use: Take one (1) capsule when smooth energy and focus is desired. Do not exceed four (4) capsules a day.

Warnings & Precautions

Keep out of reach of children.

Warning: Use only as directed.

Consult your physician before use if you are pregnant or nursing, have a serious medical condition, or use prescriptions medications.

For adult use only.

Formulation Notes

Energy & focus

Formulated with 200mg L-Theanine + 100mg Caffeine

Helps with Energy levels Increased focus Cognitive performance

Made in USA quality guaranteed

Additional Information

Storage: Store this product in a cool dry place below 30 degrees C (86 degrees F).

Metadata

Product Details

UPC / SKUX0028C766P
DSLD Entry Date2021-02-25
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
BrandNutriana
DSLD ID244028
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 →
Compare

Similar Products

L-Theanine
XYMOGEN · Capsule
100
L-Theanine
XYMOGEN · Capsule
100
Thea-Zen
HBC Protocols · Capsule
100
L-Theanine 100 mg
Newflower Farmers Markets · Capsule
100
L-Theanine 200 mg
Vitamin World · Capsule
100
View all L Theanine products →
L Theanine research Best L Theanine All L Theanine products More from Nutriana View on NIH DSLD →

This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.