L-theanine is a naturally-occurring amino acid, first discovered in green tea in 1949 by Japanese researchers.  Most dried tea leaves contain approximately 1-2% l-theanine, which lends to their savoury flavour when steeped.

How Does L-Theanine Work?

When you drink tea or take l-theanine orally as a supplement, it absorbs through your intestines, circulates in your bloodstream, and crosses your blood-brain barrier, where it has a number of benefits:

1. Supports Calm Focus and Mental Clarity

Research suggests that l-theanine is the secret ingredient that causes caffeine from tea to behave differently from the caffeine in coffee and actually enhances the effects of the caffeine without inducing the jitters or excitatory effects attributed to caffeine.  It also helps improve cognitive performance and memory

2. Supports a Healthy Stress Response

Numerous human studies suggest that consuming l-theanine regularly helps support a healthier response to stressful situations allowing us to deal with stress much more effectively.

3. Supports Brain Health 

L-theanine crosses your blood-brain barrier and helps support improved growth and repair of nerve cells, improved levels of neurotransmitters such as serotonin and GABA and improves calm focus and a healthy stress response all while supporting a healthy brain.

4. Support Healthy Immune Function and Reduces Inflammation

According to a study from Brigham and Women’s Hospital, l-theanine may support a healthy immune response to infection, which is great in the winter months, and it can also help to naturally reduce inflammation

5. Support Better Sleep 

Research supports that people with anxiety slept better when they took high doses of l-theanine daily as well as drank tea containing L-theanine

How to Take L-Theanine

Steeping tea longer and hotter may extract l-theanine more efficiently. And while small amounts of milk don’t affect l-theanine levels, adding a lot of milk may reduce the l-theanine content of your beverage

Overall, l-theanine is extremely safe, with no serious reported adverse effects.

Tea is the most cost-effective source of theanine, and also offers additional health benefits thanks to its catechins and polyphenol antioxidants. The Calm and Joy Signature Blend tea is an excellent source of l-theanine.