Stewart's Flavor Enhancer for Dogs Digest, dried brewers yeast, rice flour, bean gum, powdered cellulose, calcium carbonate Stewart's Flavor Enhancer is a combination of powdered, spray-dried proteins derived from beef and chicken sources as well as yeast-derived flavors. It is a very fine powder that allows the product to cling to the surface of food. The product is adjusted to a 1:1 calcium/phosphorus ratio. An inert carrier powdered cellulose is used to ease the flow and inhibit caking of the product.