CORALadvantage is A Full Spectrum Support Nutrient System formulated to make it effective even if you are deficient in one or more of the support nutrients required for calcium absorption and utilization by your body. Our all natural sango marine coral has a biologically optimal calcium to magnesium ratio of 2:1, providing a natural form of the primary support nutrient magnesium. To this we add our potent Full Spectrum Support Nutrient System, with the primary co-nutrients needed for calcium absorption, as well as secondary co-nutrients to support the primary co-nutrients. For example, co-nutrients essential to the absorption, uptake and utilization of calcium include boron, lysine, manganese, and Vitamins A, C, D and E. Magnesium requires Vitamin B6, and manganese and Vitamin B6 need Vitamin B complex for absorption. Vitamin A needs zinc and Vitamin E needs selenium. Also, we exceed the 800 IUs of Vitamin D that recent studies show are required for good calcium absorption. Compare labels and you will see the difference.