The Library · Vol. 01Entry No. 23· Chapter 03

L-Theanine

L-γ-glutamylethylamide

An amino acid found almost exclusively in tea leaves. L-Theanine promotes calm focus by increasing alpha brain waves - the same state achieved during meditation.

1
Active compounds
6
In our products
1
Clinical citations
03
Nootropics & Brain
L-Theanine (L-γ-glutamylethylamide)

L-γ-glutamylethylamideBotanical illustration

§ 1The molecules

Active compounds.

1 compound · 3 statements

No.01

L-Theanine

Why this matters

  • № 01Promotes alpha brain waves for relaxed alertness*
  • № 02Takes the edge off caffeine without reducing its benefits*
  • № 03Supports focus without drowsiness*

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

§ 2Receipts

What the research shows.

1 citation

“Multiple clinical trials demonstrate that combining caffeine with L-theanine produces superior cognitive benefits compared to either alone. A meta-analysis of 15 studies found the combination significantly improved reaction time, attention accuracy, and mood. L-theanine helps maintain focus while smoothing caffeine's stimulant effects.”Nutrition Reviews, 2025

§ 3Where it lives

Find L-Theanine in

6 products

Cognition Boost
Cognition Boost
100 mg
$22.42$29.90
Alpha Chill Strips
Alpha Chill Strips
50 mg
$19.42$25.90
Clean Energy Strips
Clean Energy Strips
30 mg
$20.92$27.90
Energy Powder (Lychee)
Energy Powder (Lychee)
100 mg
$23.92$31.90
Focus Powder (Sour Grape)
Focus Powder (Sour Grape)
100 mg
$29.92$39.90
Reishi Balance Chill Gummies
Reishi Balance Chill Gummies
25 mg
$17.92$23.90
From the Library · Vol. 01

Know exactly what
you're taking.

Every compound in your stack — sourced, dosed, and cited. No proprietary blends. Browse the science behind the bottles.

118Ingredients
180Compounds
14Chapters
Browse by chapter
Compounds that support cognitive function.Showing 2 of 2 · View all
Bacopa
№ 17 · CH.03

Bacopa

Bacopa monnieri

An ancient Ayurvedic herb known as 'Brahmi', used for thousands of years to enhance memory and learning.

Bacosides
Chinese Club Moss
№ 18 · CH.03

Chinese Club Moss

Huperzia serrata

A primitive, slow-growing moss native to mountain forests of China and Southeast Asia, used in Traditional Chinese Medicine for centuries.

Huperzine A

We publish every dose, every source, every paper we leaned on. An informed customer is our only kind.

Browse the full library
From the Journal

Keep reading.

Journal · l-theanine
Mar 12, 2026

L-Theanine + Caffeine: The Productivity Stack That Actually Has Research Behind It

Most people who drink coffee are running a flawed protocol. Not because caffeine doesn't work — but because caffeine alone produces cognitive costs alongside its benefits. L-theanine is what's missing.

Read article→

— End of entry

Put L-Theanine to work.

Browse the products it’s in, or build a stack around the goal it serves best.

Shop products Build a stackBack to the library