Getting adequate calcium is becoming a top priority as our population ages. Bodily changes that go along with advanced years create more of a demand for essential minerals, and obtaining adequate amounts through diet is not always enough. Calcium cannot be properly absorbed into the system without sufficient amounts of magnesium and zinc to help it along.
Vitamin D3 is added to support calcium absorption. Also betaine HCl and glutamic acid HCl contain hydrochloric acid (the same acid the stomach produces that helps break down dietary contents).