THIS IS AS GOOD A PRODUCT AS YOU CAN GET IN COMBINING A  CHELATED MAGNEISUM AND CALCIUM. SO, WHY TEAM UP THESE TWO MINERALS? AS WELL AS BEING INVOLVED IN HEALTY BONE BUILDING, CALCIUM IS INVOLVED IN MUSCLE EXERTION. MAGNESIUM, ON THE OTHER HAND, IS INVOLVED IN MUSCLE RELAXATION. AS MENTIONED, IT IS ALSO THE MASTER MINERAL OF THE NERVOUS SYSTEM. THE MAJORITY OF SUPPLEMENT BUYERS USE THESE TWO MINERALS TOGETHER.