Natural Factors L-Theanine - 250 mg - L-theanine to temporarily promote relaxation and mental clarity. L-theanine is found naturally in green tea and has long been known to promote relaxation in green tea drinkers. It can also be made for supplementation through a natural fermentation process that mimics its production in green tea leaves. L-theanine is absorbed quickly and provides a noticeable effect within 30–40 minutes of supplementation. It is transported directly to the brain, where it stimulates the alpha brain waves associated with an awake yet relaxed state of mind. L-theanine provides relief from symptoms of occasional and daily stress, helping to calm the nerves and focus the mind. L-theanine is a fantastic option for adults looking to improve symptoms of occasional and daily stress using a non-drowsy and non-habit-forming supplement.