Formula 707 Calming Equine Supplement Help nervous, excitable horses relax and improve their ability to concentrate on work and training. COMPLETE support for the three processes that lead to a balanced central nervous system: serotonin, nutrition, and relaxation. L-Tryptophan aids serotonin delivery and can decrease anxiety; Thiamine (B1) addresses nutritional deficiencies and metabolic processes; Magnesium supports calm, relaxed muscles. Formulated and manufactured by John Ewing Company in Colorado, USA, where we've been Helping Horses Succeed Since 1946