What is L-Theanine (Green Tea Extract)?

TIZAN is L-Theanine for sleep and anxiety (Green Tea Extract) supplier, and we produce L-Theanine with green tea leaves.

L-Theanine, also known as L-γ-glutamyl-ethyl amide and N5-ethyl-L-glutamine, is an amino acid analog of the proteinogenic amino acids L-glutamate and L-glutamine and is found primarily in particular plant and fungal species. Scientists discovered it in 1949, then isolated it from green tea, which have high theanine content.

As an analog of glutamate and glutamine, the small intestine absorbe the theanine in common preparations after oral ingestion; its hydrolysis is L-glutamate and ethylamine and occurs both in the intestine and liver. It can also cross the blood–brain barrier intact and register pharmacological effects directly.

It may help the body’s immune response to infection by boosting gamma delta T cells’ disease-fighting capacity. The report pointed out that it raises brain serotonin, dopamine, and GABA, with possible improvement in specific memory and learning tasks.

L-Theanine and caffeine’s combination promotes faster simple reaction time, faster numeric working memory reaction time, and improved sentence verification accuracy. Due to this, the combination has become popular over recent years as a nootropic supplement typically found in the form of a pill, drink, or gum.

Japan approved it for use in all foods, including herb teas, soft drinks, desserts, Etc., with some infant food restrictions. It provides a unique brothy or savory flavor to green tea infusions. FDA generally recognizes it as safe (GRAS) as an ingredient and sold it as a dietary supplement in the US.

What is natural L-Theanine Powder used for?

Traditional/Ethnobotanical uses

Second only to water, tea is the most widely consumed beverage in the world. It was discovered as a constituent of green tea in 1949 and was approved in Japan in 1964 for unlimited use in all foods, including chocolates, soft drinks, and herb teas, except infant foods. It also provides a unique umami (brothy or savory) taste and flavor to green tea infusion.

L-Theanine for anxiety

It may help relieve stress by inducing a relaxing effect without drowsiness and may also possess immunologic attributes. It may also have effects on the cardiovascular system and play a preventative role in cancer; however, limited clinical information is available to support these claims.

Health Benefits

  1. L-Theanine for sleep and anxiety
  2. Improves brain function
  3. Reduces negative effects of caffeine and improves its cognitive-enhancing effects.
  4. Protects the heart and blood vessels.
  5. It is a natural antioxidant.
  6. Increases sleep quality.
  7. Reduces symptoms of schizophrenia.
  8. Enhance th1 immunity and combat stress-related weakened immunity.
  9. It as an adjunctive cancer treatment.
  10. Reduce symptoms of depression.
  11. It helps with weight loss.
  12. It may heal stomach ulcers.


L-Theanine20%, 35%, 40%  HPLC
AppearanceBrown Yellow Powder
Particle Size100% Pass 80 Mesh
SolubilitySoluble In Water

Shelf Life

2 Years


Store in tightly sealed containers then places in a cool and dry place while away from moisture, light, and oxygen.


  • Packed in paper-drums and two plastic-bags inside. N.W:25kgs .I.D.35×H51cm.
  • 1Kg/Bag (aluminum foil bag).
  • Sample: double sealed water plastic bags inside with the aluminum bag outside.

Where to buy L-Theanine for sleep and anxiety (Green Tea Extract)?

Just send an email to [email protected], or submit your requirement in bottom form. We are of service at any time!