Best Naturals Coral Calcium Plus contains an alkaline form of Calcium that can help to promote a healthy serum pH. In addition, Coral Calcium has a number of naturally occurring trace minerals that are important for bone health, as well as for optimal enzymatic activity. Best Naturals Coral Calcium is eco-friendly: it is harvested in Okinawa, Japan from fossilized (dead) coral and is not harmful to living coral. In this Coral Calcium Plus formula, Magnesium and Vitamin D have been added because of their essential role in bone metabolism.+ Certain research publications indicate that Coral Calcium may help support the following: