Metabolic Maintenance L-Theanine 100mg supports focus, attention, protects nerve cells, and reduces stress response. L-Theanine is an effective GABA precursor and supports healthy relaxation without drowsiness. It can cross the blood-brain barrier, L-theanine helps increase brain dopamine levels and helps support a normal immune system. Recommended Use: Take 1 capsule daily, or as directed by a healthcare professional. Best taken between meals.