20 milligram of biotin, more than many other leading supplements. Biotin is the major vitamin that is the building block for healthy hoof growth and maintenance. Contains high levels of methionine and lysine necessary to support biotin. Enclosed scoop holds 1 ounce. Feed 1 ounce (1 scoop) per day for maintenance. Increase feeding of large breeds proportionately according to body weight in excess of 1,000 pounds.Size is 20 Pound. Dimensions are 12.25 X 10.75 X 13.75 Lysine, Methionine, Cysteine, Sulfur, Manganese (Mn), Zinc (Zn), Copper (Cu), Silicon (Si), Vitamin B6, Biotin. UPC Code = 758900005099