In mother nature's kitchen there are no synthetic supplements, and dogs and wolves derive all of their nutritional needs by consuming whole prey animals. Muscle meat provides protein; liver, kidney and tripe supply vitamins and minerals; while bones and cartilage deliver calcium and phosphorus. Acana mirrors the natural diet, applying our meat Math and incorporating wholeprey meat, organs and cartilage in ratios that deliver nutrients naturally. By providing a concentrated, natural source of virtually every nutrient your dog needs to thrive, you eliminate the need for long lists of synthetic additives. That's why zinc is our only added supplement.