NuMedica L-Theanine 120cNuMedica L Theanine Relaxation and Stress Relief. Naturally occurring, unique amino acid found in green tea leaves. NuMedica's L Theanine is Suntheanine the most respected source and the one which has been used in scientific studies. L Theanine may promote a sense of relaxation without causing drowsiness. It has also been found to promote healthy cellular function and reduce feelings of stress and anxiousness. L Theanine may be useful in reducing the