Peter Gillham's Natural Calm Plus Calcium is formulated with 3 parts magnesium to 2 parts calcium, which will prevent a surplus of calcium robbing the body's vital magnesium supply and avoid the symptoms associated with depleted levels of magnesium. This superior formulation includes potassium, boron and vitamin D for better absorption of these key minerals, building strong bones, regulating hormones and more. You can't buy a better calcium/magnesium product.