Studies show that vitamin D is crucial for strong bones. Yet only one in ten Americans get the amount of vitamin D that research suggests is optimal. With 2000 IUs of vitamin D3 and potent levels of ipriflavone, silica and ionic trace minerals, Bone-D is perhaps the world's best bone support system. It can be used alone, or with Ionic-Fizz Calcium Plus or any other high quality calcium/magnesium supplement (calcium should never be used with less than equal levels of magnesium). It can also be used with any multiple that does not provide more than 4000 IUs of vitamin D per day.