Ker-A-Form is a supplemental source of biotin, methionine, zinc, and iodine. Feed All Classes of Horses 1-2 Ounces Per Day with Feed (1 Scoop = 1 Ounce). Product is made with Ground Extruded Whole Soybeans, Lecithin, Yeast Culture, Dl-Methionine, Zinc Proteinate, D-Biotin and Ethylendiamine Dihydriodide.