The #1 ingredient of this formula is salmon, which provides high protein and promotes muscles growth. In addition, it aids in promoting cognitive function and brain health. Also, it supports healthy skin and shiny coat. Additionally, it is hypoallergenic protein. Since brown rice is the source of carbohydrate, it is easily rehydrated and digestible. Moreover, this formula also includes natural antioxidant from Rosemary and Vitamin E. You can be confident that your beloved cats will be specially taken care of by SmartHeart Gold.