SynChill was developed to reduce stress and anxiety in horses without impeding performance. Given 1-2 hours prior to a stressful event, it helps horses relax, focus and perform. SynChill contains NO DRUGS OR BANNED SUBSTANCES. A proprietary blend of 5-HTP, vitamin B6 and melatonin are used to increase serotonin in the central nervous system to calm nervous horses. SynChill uses a very small volume because, unlike tryptophan, 5-HTP freely crosses the blood-brain barrier for a quick and direct calming effect.