Complete Bone Nutrition Purity-Certified MCHC with Magnesium Cal Apatite with Magnesium is the same formula as original Cal Apatite®, but with the addition of 300 mg of magnesium per serving. Magnesium plays important roles 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. Does not contain magnesium oxide THREE TABLETS SUPPLY: Microcrystalline Hydroxyptite Concentrate (MCHC)† 1,500 mg Calcium (as MCHC and dicalcium phosphate) 600 mg Phosphorus (as MCHC and dicalcium phosphate) 378 mg Magnesium (as magnesium citrate, aspartate, and bis-glycinate††) 300 mg Recommendations: One to six tablets daily. Form: 180 Tablet Bottle