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Science-Based Health Benefits of L-Theanine

Science-Based Health Benefits of L-Theanine

L-theanine is a non-essential amino acid that can be found in green tea leaves from the Camellia sinensis plant. In addition, it is also available as a supplement.

Research has shown that L-theanine supports relaxation and it is frequently used as a supplement for stress relief.

L-theanine is included in Sleep Support by Beyond Vita®. 

1. Stress and Anxiety

L-theanine can help ease anxiety and reduce stress according to a 2016 review.1 They also found that it was able to help users relax without causing drowsiness.

In an eight week study focused on people with schizoaffective disorders, researchers discovered that L-theanine improved their symptoms and decreased anxiety.2

Another study found that L-theanine has the potential to improve stress related ailments and a 2018 review found it may assist in the reduction of stress and anxiety in people exposed to stressful situations.3,4

L-theanine has been shown to help improve relaxation, anxiety and response to stress.

2. Helps Improve Sleep

Research shows that L-theanine can help improve sleep quality. A 2016 review found that L-theanine greatly improved sleep in study participants in addition to promoting relaxation which helps with falling alseep.5

In a six week study in 2011 that looked at the effects of L-theanine in adolescent males, researchers found that participants were able to sleep longer and wake up feeling better rested when compared with a placebo.6

Another study discovered that it improved the quality of sleep in patients who have been diagnosed with schizoaffective disorders.7

In a 2018 study on L-theanine and generalized anxiety disorder, researchers found that L-theanine treated participants indicated a greater level of sleep satisfaction when compared to a placebo.8

L-theanine can help improve sleep quality and increase time spent sleeping.

3. Boosts Immunity

L-theanine may boost the body’s immune system to better help fight infections. A 2016 review into the effects of L-theanine on the body found that it may help reduce the rate of upper respiratory tract infections.9

L-theanine may help improve the body’s immune system.

4. Increases Focus

L-theanine is frequently referred to as a nootropic that may help boost attention and focus.

In a 2011 study researchers claim that L-theanine may represent a safe and important adjunctive therapy in childhood ADHD.10

A study published in the Journal of Nutritional Neuroscience found that the combination of L-theanine and caffeine improves cognitive performance and increases self reported alertness.11

L-theanine has also been indicated to promote alertness and relaxation which help with remaining focused.12

L-theanine has been shown to help improve focus and attention span.

5. May Reduce Blood Pressure

L-theanine may help lower blood pressure during stressful situations.

A 2012 study found that L-theanine decreased the blood pressure increase in adults who have a high stress response.13 The same study also found that caffeine has a similar but smaller inhibition of the blood pressure increase.14

L-theanine has been shown to help reduce the increase in blood pressure due to stress.

6. Tumors and Cancer

L-theanine may reduce the risk of cancer.

A 2004 study in China found that women with ovarian cancer lived longer if they drank green tea each day.15

Furthermore a 2012 study published in the Journal of Cancer Epidemiology found that the regular consumption of green tea lowered the risk of pancreatic cancer.16

L-theanine may increase the survival rate from cancer and reduce the risk of developing it.


L-theanine is an important amino acid that has a variety of health benefits.*

We recommend Sleep Support by Beyond Vita®.  It includes the best science supported natural ingredients including l-theanine.
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