These capsules eliminates muscle cramps when taken daily. When I forget or run out, the cramps return. Also it is great to have a Ca & Mg combined capsule, as we should always consume Calcium at the same time as Magnesium to keep them balanced. If you take Mg on it's own without Ca it can lead to an imbalance of Ca and the body then starts leaching it from bone, causing brittle bone syndrome. So I am glad that a Mg supplement company combines with Ca, and the added Vitamin D3 etc is a bonus for healthy bones.