Maxi Health Research has combined calcium citrate with magnesium, vitamin D3 and boron, to give you the ultimate support for healthy bone and teeth. Calcium, the most abundant and possibly the most vital of all nutrients, constitutes the majority of all minerals in our body. Calcium loss is constant as the body carries on its daily functions and remodeling occurs every ninety days. In addition, calcium is essential for the contraction of muscles, conducting nerve impulses and enzyme activity. Calcium citrate (which is better absorbed than calcium carbonate), is possibly the most bioavailable form of calcium.