Cal Apatite with Magnesium benefits from all the qualities of Cal Apatite 1000 but with the addition of 200g of magnesium per serving. • Magnesium plays an important role in bone metabolism, with over one-half of the total body stores of magnesium found in bone tissue. • Provides a 2:1 calcium to magnesium ratio. • Magnesium is provided as a blend of glycinate, citrate and aspartate for enhanced absorption.