Due to the current high volume of orders, we are experiencing brief delays with some shipments. Most orders will ship within 5 business days.



31 items left

Looking for bulk options? Click Here

Next Previous

Supplement Facts & Directions

Supplement Facts

Serving Size: 500 milligrams
Servings Per Container: Varies
Amount Per Serving % Daily Value*
L-Theanine 500mg

* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value Not Established
‡ These supplement facts may vary from the product you receive.    Please call for exact numbers.

Other Ingredients: None


Free of:  Sugar, Soy, Dairy, Yeast, Gluten & Additives.

Directions:  As a dietary supplement, take 500 mg (level unpacked 1/4 tsp) up to three times daily, or as directed by a physician.

Warning: If you are pregnant, nursing, taking any medications or have any medical condition consult your physician before use. DO NOT use if you are taking blood pressure medication. Keep out of reach of children.


Product Details

What is L-Theanine?

L-Theanine is an amino acid which can be found naturally in green tea (Camellia sinesis) and other species of Camellia. The health and relaxation benefits of drinking green tea have been widely discussed. It is now found in nutritional supplements, foods, protein bars, weight loss formulas and beverages.

Because green teas sold in North America contain less than 10 milligrams of L-theanine per serving, most people don’t drink enough to feel its effect. The dietary supplement L-theanine may offer a better option.

Purity and Concentration of L-Theanine

This amino acid contains no additives, fillers or anti-caking agents. It is synthetically produced from mineral sources and is both vegetarian and vegan.

Bioavailability, Mixing and Solubility of L-Theanine

This product dissolves quickly in water and has a mildly bitter taste comparable to green tea. Mix with water, hot tea or juice.

How should I store it?

You will receive a re-sealable bag of this powder. Store in a cool, dry area protected from light. Reseal after each use.

References & Further Research

Biological Psychology Journal: L-Theanine reduces psychological and physiological stress responses

SpringerLink: Psycho-pharmacology Journal: Time for tea: Mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together 

University of Maryland Medical Center: Stress

The information at Purebulk.com is NOT a substitute for medical advice. ALWAYS consult your doctor or pharmacist. Do not use any dietary supplement as a replacement for conventional care, or as a reason to postpone seeing a doctor about a medical problem. Tell all your health care providers about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care. The U.S. Food and Drug Administration (FDA) regulates herbal and other dietary supplements differently than conventional medicines. The standards for supplements are found in the Dietary Supplement Health and Education Act (DSHEA), a federal law that defines dietary supplements and sets product-labeling standards and health claim limits.

Tested by Accredited 3rd Party Labs

PureBulk's supplements are tested by accredited third party labs in the USA to ensure their identity, purity and potency. To receive a copy of these test results or any other PureBulk supplement please fill out the COA request form found here.

*NOTE: 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.