(Kaeco) All-natural support for optimal immune function and muscular health. Selenium, in conjunction with Vitamin E, is necessary for proper functioning of the immune system and to protect the integrity of cell membranes. Horses lacking adequate sources of selenium may be susceptible to muscular dystrophy, or white muscle disease, in foals. Each 1 oz. daily dose provides 1250 IU natural Vitamin E, 2mg Selenium, plus Lactobacillus for digestive health. Butterscotch flavor. Powder.