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L-theanine, also known as Suntheanine, comes from tea leafs used to produce green, black, and white teas. L-theanine is also found and isolated from an edible mushroom called Boletus badius, which is found in the summer and autumn seasons in the United States.

Benefits of L-Theanine: L-theanine is generally used to relieve stress without any drowsy effects on the person. It is also known to boost the immune system. There are claims that say L-theanine plays a role in the promotion of cardiovascular health and the prevention of cancer. It has also been found that L-theanine increases brain concentration for up to five hours upon intake, through a rise of theanine in Hippocampus. 

Found In: Tea Leafs are used to produce green, black, and white teas.