Yes, I used to use this suppliment. It is a derivitive of green tea, and is said to have a calming effect of the body and mind. I believe it also has some antioxidant qualities which is good.:)
Give it a try, and see if it is useful for you. (always check w/ your doctor regarding suppliments before you start and ask about
possible interactions w/ current meds)
Let us know what you think,
S.C.
Here is an article/link to check out...
http://healthyeating.sfgate.com/benefits-using-l-theanine-4731.html