I like the Nature's Way Calcium, mag and D because it has all the items needed in one capsule to help build bones. They all work together as a unit. Some people just take calcium but I have read that it needs D to build the bone! So I have been taking this for quite a while to help bone loss as I age.
Finally I have found a product with magnesium that doesn't cause a laxative effect. I have tried top quality products, capsules, liquids, pills that have caused me to stop taking magnesium & only get it from food sources. This brand works great, and I have not had any digestive upset from it. Recommended.