Health & happiness start in the gut and the secret to health is successful digestion and absorption of balanced nutrition. NutriSource Grain Free dog food supports the gut microbiome with a proprietary blend of prebiotics, probiotics, trace minerals and selenium yeast. Good4Life gut-focused proprietary blend includes ingredients that nourish the gut microbiome, building the ultimate foundation for a long and happy life. Scientifically formulated, NutriSource includes a blend of carefully selected ingredients, and Good4Life to provide essential nutrients for optimum health and long life.