ORALX TRYPTOPHAN blends the amino acid L-Tryptophan with chelated magnesium and vitamin B-6 which are present in the formula to enhance the effect of the L-Tryptophan in aiding the proper function of a horse's nervous system. Because L-Tryptophan cannot be synthesized by the body, it must be supplemented if lacking in the diet. This product can ease a nervous horse without affecting its ability to compete. Directions: Can be added to feed. Use one tube 4 hours before an event..