Composure combines L-Theanine, Thiamin (B1), Lecithin (from soy) and Decapeptide from milk protein hydrolystade, which all address stress and calming. Thiamin specifically has been shown to affect the central nervous system to help calm and soothe anxious animals. When pets cannot adapt to stress, it can lead to anxiety, nervousness, hyperactivity, frayed nerves, excelled barking, abnormal urine marking, repeated paw licking, scratching, trembling, and destructive or aggressive behavior.