Special blend of herbs and essential amino acid l-tryptophan (essential to life and unable to be synthesized by the body). L-tryptophan is least abundant in typical animal feeds and is therefore often lacking in the diet and must be supplemented. L-tryptophan is essential to the proper functioning of the nervous system. In a pelleted form. Size is 6 Pound. Dimensions are 8 X 7.5 X 7.5 UPC Code = 076110700994