Heartland Select Grain-Free Formula features the NutriSource exclusive “Good 4 Life” system and is made with the finest quality ingredients available. Made with peas, a low glycemic legume, also a great source of protein, fiber, and the essential amino acid lysine. Peas supply complex carbohydrates, vitamins A and C, iron and beneficial fiber to support digestive function. This formula combines bison & chicken and carefully selected ingredients in the precise blend to balance all essential nutrients necessary for optimum health, well being and long life.