Oyster Shell Calcium 500mg + Vitamin D 100 Count. Active Ingredient: Vitamin D-3 200 I.U., Calcium 500 mg. Directions: Adults – one tablet, twice a day. Purpose: Nutritional Supplement. Inactive Ingredients: calcium carbonate, cellulose, acacia, maltodextrin, croscarmellose sodium, hypromellose, titanium dioxide, soy polysaccharide, triacetin, sodium lauryl sulfate, talc, mineral oil, starch, sucrose, riboflavin, FD&C Blue #1 lake, sodium ascorbate, triglycerides, silica and tocopherols.