If you haven't looked at Keith McCormick's book Great Bones yet, I would suggest that you do. He gives a wealth of information about what is needed to build strong bones, including minerals other than calcium. Vitamin K2 is very important (I get mine from Nordic Naturals, which was recommended by a Ph.D. herbalist at the university integrated medicine clinic - she's done 3rd party reviews of their products herself and says that what they say is in it really is). Of course, you also need Vitamin D and, surprisingly, Vitamin C. I also take magnesium and zinc, and two kinds of calcium (carbonate (TUMS) and citronate). Calcium needs a little fat to carry it (not sure "carry" is the correct scientific term - lol), so make sure you have a tiny bit of fat in the meal that you take your supplements with.

Also, don't forget to focus on foods that are high in calcium and minerals. Calcium from food is much more readily absorbed over supplements.