How much L theanine should I take for anxiety?

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Researchers in one study found that doses of 250 mg and 400 mg of L-theaninegreatly improved sleep in animals and humans. Also, 200 mg of L-theanine was shown to reduce resting heart rate, pointing to its ability to promote relaxation. ... A randomized group was given two 100 mg chewable tablets of L-theanine twice daily.

http://www.topketodietreviews.com/definitive-guide-of-l-theanine/