Dr. Hand discusses L-Theanine, a component of green tea that helps settle the brain. This amino acid balances brain chemicals important for calm behavior. L-Theanine also triggers the production of alpha brain waves, which promote deep relaxation and mental alertness—without causing drowsiness. Plus, L-Theanine boosts levels of other calming amino acids such as dopamine, GABA, and tryptophan. The result? Less irritability and more peace around your house.*