A deer's available diet seldom supplies all the minerals, vitamins, and protein necessary for maximum good health and growth. Provides a tremendous amount of antler-growing protein on a year-round basis, other minerals and vitamins may be unavailable. It is beneficial for deer to have available a mineral and vitamin supplement on a daily basis. Scientifically developed after years of observation by wildlife biologist, veterinarians and field testers for the Whitetail Institute of North America.