Vanadyl Sulfate Has been shown to reduce and improve glucose tolerance as well as increase insulin action inside living cells. These mechanisms are used in rapid tissue growth particularly when stressed. Optimum Nutrition Vanadyl Sulfate contains 10mg of pure Vanadyl per tablet.Serving Size: 1 Tablet Servings per Container: 200Amount per Serving: Calcium (as dicalcium phosphate) 139mgPhosphorus (as dicalcium phosphate) 108mgVanadyl Sulfate (yields 3.1mg of Vanadium) 10mg