Among the benefits of tea as a wellness ally is its supply of amino acids. Among the amino acids, the essential constituents of proteins, that of greatest interest is L- Theanine (gamma-glutamylethylamide), only found in tea, thought to be higher in green and white tea. Theanine enhances the release of some ''calming'', ''relaxing'' neurotransmitters in the brain such as serotonin and dopamine, thus balancing the stimulating effects of caffeine on the central nervous system. It also appears to prevent ischaemic neuronal damage and contributes to the delicious 'umami' (savoury) taste.