Via-Calm is a supplemental source of l-tryptophan, thiamine, calcium, and magnesium for nervous, agitated, and high strung horses. Via-Calm is for horses that may benefit from or require these nutritional components prior to a stressful situation such as training or a competitive event, or where supplementation may prevent a dietary deficiency. 1000 mg l-tryptophan, 500 mg thiamine, 227 mg calcium, and 142 mg magnesium per 1 oz. (Please check competition rules regarding the use of tryptophan.) Feed 1/2 to 1 oz. per 1000 lbs. daily. May feed up to 2 oz. just prior to an event.