Healthaid l theanine tablets are specially formulated using the purest form of theanine l theanine is a naturally occurring amino acid in japanese green tea that acts as a neurotransmitter in the brain l theanine may help promote a relaxed and restful state without diminishing alertness or causing drowsiness it is a natural way to help reduce stress without the side effects commonly associated with other relaxing agents while promoting a sense of calm well being