What is theanine?
L-theanine is an amino acid found in green tea.
It is extremely rare.
To date it has been identified in tea (Camellia sinensis) and in a mushroom (Xerocomus badius, the Bay Bolete).
There are higher amounts in gourmet green tea (look for younger leaves and buds, mountain grown green tea), with lower amounts in oolong and black tea.
The amount will also vary with climate.
Human research has shown improvements in mental performance, with simultaneous improved focus and a general calming effect.
Other preliminary studies have shown potential enhancement of the immune system, including multiple cancer studies.
Here are some of them:
Reducing beta amyloid damage for Alzheimer's Disease
Dopamine research including 5 cups of green tea daily for increased well-being and improved memory
Increased serotonin in the brain with potential anti-depressant activity without side effects
Preliminary cancer studies show reduced liver cancer, breast cancer, colon cancer, ovarian cancer, and prostate cancer
Non-small cell lung cancer suppression of carcinoma growth and migration
Improving potency of chemotherapy while diminishing cellular damage side effects
Flu vaccine effectiveness for elderly patients
Learn more about your health with a free subscription to the Green Tea Health Newsletter:
This page last updated by Sharon Jones.
Was this page on theanine helpful? Here's more health info
Return to Green Tea Health News Home
Subscribe now and don't miss a single issue.
Find out more!