100 mg, 60 vegetarian capsules Item # 01683

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100 mg, 60 vegetarian capsules Item # 01683

Promotes a calming & mood-enhancing effect

Life Extension’s L-Theanine supplement contains an amino acid derived from tea. L-Theanine has been shown in several studies to support a healthy stress response and promote a calm, relaxed state of mind.

Gluten free Non-GMO Vegetarian
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$0.30 / count | 15 - 60 Day Supply
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$0.26/count | 15 - 60 Day Supply

Peace and calm. Love this stuff!


Highly recommend.

Vivian, MN

I buy this product often. It works great for me.


For calming and stress relief. Our go to supplement.


Frequently Bought Together

  • This Item: L-Theanine, 100 mg, 60 vegetarian capsules
  • Glycine, 1000 mg, 100 vegetarian capsules

Total Price:



100 mg, 60 vegetarian capsules


$0.30/count | 15 - 60 Day Supply

What Is L-Theanine?

L-Theanine is an amino acid found in tea that produces calming effects by favorably modulating several aspects of brain activity. L-Theanine induces brainwave patterns similar to those associated with meditation and massage.

The calming effects of the L-Theanine produce brainwave patterns similar to meditation & massage.

L-Theanine Benefits

  • Promotes relaxation by helping to support a healthy stress response
  • Encourages brainwave patterns similar to those associated with meditation & massage
  • Involved in production of gamma amino butyric acid, the neurotransmitter that influences levels of dopamine and serotonin

Pure L-Theanine

Laboratory analysis confirms that theanine used in our formulation contains only the pure L-Theanine form of this amino acid.

Why Life Extension?

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Product Transparency

99% of our products are manufactured in the U.S, and a Certificate of Analysis is available for every product we produce.

High-quality theanine supplement

L-Theanine benefits have been known around the world, especially in eastern Asia, for centuries. Although the ancient civilizations may have named L-Theanine differently, they understood and explored the relaxing and calming effects of this compound.1 Theanine used in our formulation contains only the pure L-Theanine form of this amino acid.

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

Serving Size 1 vegetarian capsule

Amount Per Serving

AlphaWave® L-Theanine

100 mg

Other ingredients: microcrystalline cellulose, vegetable cellulose (capsule), silica, vegetable stearate.


AlphaWave® is a registered trademark of Ethical Naturals, Inc.


Dosage and Use
  • Take one (1) capsule one to four times daily, or as recommended by a healthcare practitioner.
  • Do not purchase if outer seal is broken or damaged.
  • When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.

To report a serious adverse event or obtain product information, contact 1-866-280-2852.

Actual Size

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  1. Crit Rev Food Sci Nutr. 2017;57(8):1681-1687.
  2. Biomed Pharmacother. 2017;95:1260-1275.
  3. Trends in Food Science & Technology. 1999;10(6):199-204.
  4. Alternative and Complementary Therapies. 2001;7(2):91-95.

Product reviews are provided for informational purposes only and reflect solely the views and opinions expressed by the contributors and not those of Life Extension. We do not verify or endorse any claims made in these reviews. Please read the full product reviews disclaimer.

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