Calcium carbonate, oyster shell flour, salt, calcium sulfate, potassium chloride, ferrous fumarate, magnesium oxide, zinc oxide, manganous oxide, copper sulfate; Guarenteed Analysis: Moisture (max) 12.0% Magnesium (min) 0.03% Calcium (min) 35.0% Sulfur (min) 0.04% Calcium (max) 37.0% Iron (min) 240 ppm Salt (min) 0.06% Zinc (min) 9 ppm Salt (max) 0.07% Manganese (min) 5 ppm Potassium (min) 0.04% Copper (min) 2 ppm