New Roots Herbal L-Theanine - An amino acid found in green tea, L-Theanine crosses the blood-brain barrier to increase alpha brain-wave frequency. This helps ease anxiety and promote mental clarity and concentration, it helps to establish a state of relaxation while maintaining alertness. Studies have shown L-theanine to encourage alpha wave activity associated with a state of serenity and mental clarity. It also insulates the nervous system from stress that can cause dangerous spikes in blood pressure, and carbohydrate cravings that result in accumulation of stubborn belly fat.