Riboflavin (B2) helps in the prevention of cataract development on a dog’s eyes, which is a common problem in Shih-Tzus and other breeds as they grow old. It also promotes healthy skin and regular circulation of blood throughout the body which is very important if you want your dog’s body to properly absorb the nutrients you give and they need. The powerful combination of other minerals and vitamins in this formulation triggers the production of antibodies that fight diseases that also helps in the proper functioning of the nervous system.