Being a huge tea nerd I lose my listeners when I get into deep nerdy tea talk to the average non-tea-nerd types. The minute I use the word "L-Theanine" I see a glaze come over the eyes and the person that I am excitedly talking to starts shrinking away until they have declared, "Oh I have to go check on..." and they split. But L-Theanine is important! Over the years and listening to scientists who have dedicated their careers to testing the benefits of L-Theanine I can't contain myself. I've learned that it is found in tea and some varieties of mushrooms. I've learned that it's an amino acid that can pass through or penetrate the blood-brain barrier. That once the amino acid passed through it gives a relaxing or calming feeling. Some claim it has all kinds of other benefits such as helping with sleep and stress. What I heard from a few scientists from Japan is that if the amino acid is present in the body when someone has a stroke or heart attack that it lessens the severity and improves the body's response to recover better as well. That is what I find so exciting about this aspect of tea. There are so many of them and L-Theanine is just one.