Virbac CAL-PLUS with BIOTINCAL PLUS WITH BIOTIN is a calcium, biotin and vitamin supplement for healthy, strong bones and hooves in horses. Specifically, it is: A treatment that promotes the growth and formation of the hoof as well as the integrity of the hoof wall A preventative and remedy for brittle, cracked and broken hooves RECOMMENDED FOR Horses on grain based diets or those fed on sub tropical grasses and hays. Foals, young horses and pregnant mares. Horses with hoof