L-Theanine is a naturally occurring amino acid found in green tea leaves, known for promoting a calm yet alert mental state without causing drowsiness. By increasing alpha brain wave activity and modulating neurotransmitters like GABA and serotonin, L-Theanine helps reduce stress while supporting mental clarity. In PureMind, it works synergistically to calm the nervous system, ease the transition to sleep, and sharpen focus under pressure.