Dr. Mercola Zen Pet L-Theanine - Stimulates mentally alert, yet calming, alpha brain waves 5-HTP - Converts to serotonin which supports feelings of well-being GABA - Helps tell the brain to slow down during times of stress Vitamin B6 - Supports a healthy nervous system and mood, and helps with serotonin production Help your pet with their stress levels and purchase a bottle TODAY!