Here are some references for my response:

1. Haskell, C. F., Kennedy, D. O., Milne, A. L., Wesnes, K. A., & Scholey, A. B. (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biological psychology, 77(2), 113-122.

2. Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological psychology, 74(1), 39-45.

3. Lu, K., Gray, M. A., Oliver, C., Liley, D. T., Harrison, B. J., Bartholomeusz, C. F., ... & Phan, K. L. (2004). The acute effects of L-theanine in comparison with alprazolam on anticipatory anxiety in humans. Human psychopharmacology: clinical and experimental, 19(7), 457-465.

These articles provide scientific evidence of the effects of L-theanine on neurotransmitters and stress responses in the brain.
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