What supplements are recommended for bone health?

What supplements are recommended for bone health?
Do you need a CT scan or is an MRI enough? Why don't we use CT guided bone marrow biopsies?
What is bisphosphonate therapy and how long should it be continued?
What is Xgeva (denosumab) and who should consider using it?
What imaging should be used to diagnose myeloma bone disease?
What is HRSMM (High-risk Smoldering Multiple Myeloma)? What are the guidelines?