NOW&ampreg; Coral Calcium Plus contains an alkaline form of Calcium that can help to support a healthy serum pH.&ampnbsp; In addition, Coral Calcium contains&ampnbsp;a number of trace minerals that are important for bone health, as well as for optimal enzymatic activity.&ampnbsp; In this Coral Calcium Plus formula, Magnesium and Vitamin D have been added because of their essential role in bone metabolism.*