Theanine? Theonine is a common misspelling of theanine.
Theanine is an amino acid that is often used in dietary supplements. It is claimed to be beneficial for conditions such as Alzheimer's disease, high blood pressure, and anxiety. Theanine may work by increasing GABA and serotonin levels in the brain and by lowering norepinephrine levels. At this time, very little information is actually available concerning the safety and effectiveness of theanine supplements.
(Click Theanine for more information about the effects of theanine, what you should be aware of before using the supplement, and how it may work for various conditions.)