L-Theanine (r-glutamylethylamide) is a non-dietary amino acid found in tea. Green tea contains exceptionally high levels of L-theanine. L-Theanine is an analogue of the amino acids glutamate and glutamine. It is broken-down in the intestine and liver into l-glutamate and ethylamine.
Quick Fact: L-Theanine easily crosses the blood-brain barrier, and is therefore known to be beneficial to the brain and for mental health.
L-Theanine is one of the very few nootropics known to modulate brain waves. It affects the alpha brain waves which are associated with relaxation. This is one of the reasons why L-theanine is used to help in relieving stress, and improve cognition
How It Works
What are the best sources of L-theanine?
L-Theanine is a naturally occurring amino acid found in plants like tea or one species of mushroom. L-Theanine is available in green, black and white teas. Green tea contains the most L-Theanine.
Studies have shown that the combined effects of L-Theanine and caffeine on cognitive performance and mood.
Quick Fact: The combination of L-theanine and caffeine has also been shown to improve speed, accuracy, and reduced tendency get distracted during tasks involving memory skills.
In addition L-theanine prevents the jittery feelings that are often associated with caffeine consumption.
- Produces a calming effect on the body.
- Reduces risk of stroke
- Improves memory
- Reduces stress
Some studies have also reported that L-theanine curbs anxiety and panic attacks.
Quick Fact: Research has shown that if L-theanine is present in the body at the time of a stroke attack, brain damage may be significantly reduced.
Recommended dosage of L-Theanine is 200 – 400 mg once or twice per day.
Quick Fact: Green tea that’s steeped correctly may contain 1-2% L-theanine per cup.
Individuals who are taking L-theanine supplements for the first time are usually advised to start with a lower dose like 100 mg per day, and progressively increase the dosage.