L-Theanine

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A naturally occurring amino acid found in tea leaves, known for promoting relaxation, focus, and stress resilience.
Supports alpha brain wave activity, promoting a calm but alert mental state. ii. May reduce cortisol levels and improve focus under stress.
Hidese, S., et al. (2019). "Effects of L-theanine on stress-related symptoms and cognitive function in healthy adults." Nutrients, 11(10), 2362.