Over 2 billion users can’t be wrong. L-theanine is a unique amino acid found only in green tea and certain mushrooms. Considering half the population of the world drinks green tea daily, an awful lot of l-theanine is consumed every day. This makes l-theanine second only to caffeine as the most consumed bioactive substance on earth.

That bioactive effect is promotion of calm and focus.* It counteracts the effects of caffeine and not surprisingly, green tea is not as stimulating as coffee.* Though the serving found in a cup of green tea is relatively small (only 1-2% of the dry weight of green tea leaves), when taken in larger servings as a supplement, the positive effects of l-theanine are remarkable.*

Benefits of L-theanine

L-theanine crosses into the brain and affects neurotransmitters in such a way as to promote calmness and improve mental focus.* Consumption of l-theanine is also associated with positive mood.* It counters the negative effects of stress-induced adrenaline secretion and supports normal blood pressure.* It does not cause sedation during the day, but does support natural sleep at night.* Because theanine is metabolized by the same pathways as other amino acids in the body, there appears to be little risk of tolerance and dependence.*

Improved focus and concentration associated with l-theanine consumption has been well documented. The electrical activity of the brain can be measured by an EEG instrument. When a person is going about normal daily activities, brain energy is very erratic and irregular. The EEG will show a wave-form called a beta-wave. When a person is focused in deep concentration, a smooth wave-form will be produced called an alpha-wave. A study conducted in Japan showed that volunteers who had had a serving of theanine were more apt to produce alpha waves than volunteer controls who had not taken theanine.

Other benefits include:*

  •  Promotes calm
  •  Promotes focus and concentration
  •  Supports normal sleep
  •  Supports normal blood pressure
  •  Associated with positive mood

Side effects are extremely rare. L-theanine is a very safe supplement that has been used by humans for thousands of years.



Ingredients similar to L-theanine:

reloraRelora® bark extract
Relora® is trademarked combination of tree bark extracts traditionally used in Chinese medicine to counter the negative effects of stress.

*This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your qualified healthcare provider before beginning any diet or program.
About the Medical Director
Dr. Bill Rawls
Dr. Bill Rawls has practiced conventional medicine as a gynecologist for
over 20 years and is also the co-founder and medical director of Vital Plan, a wellness and herbal supplement company.

Statements on this website have not been evaluated by the Food and Drug Administration. Always consult a qualified healthcare provider before making changes to your healthcare regimen.