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2005 reviews
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What Is L-Theanine?

L-Theanine is an amino acid that is found in a variety of plant and mushroom species, and is particularly abundant in green tea. L-Theanine is commonly referred to as simply Theanine, not to be confused with D-Theanine. L-Theanine possesses a unique savory, umami flavor profile and is often used to reduce the bitterness in some foods.

L-Theanine Benefits

L-Theanine may have calming effects for mood and sleep and may support brain function and aid alertness, focus, cognition, and memory. L-Theanine may also fortify immune function and support the heart and cardiovascular system.

  • Promote healthy sleep
  • Support brain function
  • Contribute to alertness and focus
  • Aid cognition and memory
  • Fortify immune function
  • Assist cardiovascular and heart health

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Supplement Facts
Serving size: 250 milligrams
Serving per container: *
Amount Per Serving % Daily Value**
L-Theanine 250mg *
* Daily Value not established.
** Based on 2,000 calorie diet


 Sugar, soy, dairy, yeast, gluten, corn and additives.

 As a dietary supplement, take 100mg to 250mg one to three times daily.

Always consult your health care provider before taking any supplements. Pregnant or lactating women, people with existing medical conditions, or people taking medications should consult their health care provider/s before taking any dietary supplement. If you experience any adverse condition after taking this dietary supplement, discontinue use immediately and consult your health care provider.

Keep out of reach of children.

Customer Reviews
4.8 Based on 2005 Reviews
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Anne H.
United States United States
I recommend this product
L theanine

Good products w quick shopping.

United States United States
I recommend this product

L-theanine = Zen. Good stuff it really keeps my anxiety away.

Edwin J.
United States United States
theanine with BS caffeine capsules

I take this with BS caffeine capsules. I believe they are synergestic increase energy the theanine take sthe jitters out of the caffeine. Better than an energy drink, more effective and downt seem as rough on the hert

United States United States
Calming influence

L-Theanine has been my 'go-to' for my all-day coffee consumption, tried the decaf route for while 'yeck', anyway I just put 1/16th tsp in my coffee, doesn't affect taste and banishes the 'jitters'. As always the product and service are just what I would expect from a reputable business, delivery was fast and without problem.

Trent C.
United States United States
theanine good

tasteless, dissolves easy

United States United States
Good product

Felt more focus than usual