In general, we recommend "non-pharmacological" therapy ie the things that you can do, without a prescription.  (If one develops a fracture, medical therapy may be indicated.)  These are the same recommendations that are given for general bone health:

1) Calcium: 1000-1500mg per day, in divided doses, from all sources (supplement and dietary consumption).

2) Vitamin D: 600-1000 units per day.

3) Weight-bearing exercises.

4) Strength-training exercises.

(Please see other posts for ideas regarding weight-bearing and strength-training exercises.)