Pure Lab Vitamins L-Theanine - Helps reduce nervousness and restlessness – and promotes relaxation, without causing drowsiness. L-theanine has been found to be beneficial for those who suffer from stress and stress-induced anxiousness, and can help increase focus during times of stress. L-Theanine calms racing thoughts, relaxes us and at the same time increases concentration and alertness. When taken at bedtime, customers report significant benefits with problems of waking up too early with spinning thoughts.