Natural Factors Stress-Relax Mental Calmness - Contains Suntheanine L-theanine, an amino acid from green tea that promotes deep relaxation and mental clarity. Producing an alert yet relaxed state of mind, it is an ideal formula for adults who want to improve symptoms of occasional and daily stress in a natural, non-habit forming way. Daily use of Mental Calmness produces a sense of calm and mental clarity, helping anyone who feels nervous and “stressed out” to regain control.