I have osteopenia-osteoporosis. Doctors keep forcing Fosamax on me which I refuse to take , based on my research and previous feedback on side effects and resulting fractures from hundreds of patients (even here at Mayo).
I presently take Citracal (calcium citrate) with vitamin D3 and Vitamin K2. K2 ensures that the calcium is directed towards the bones for absorption, instead of just going into the bloodstream. I take these twice a day and will not get another bone density test for a while because I want to give this approach a chance.
Be careful with the type of calcium you choose. They all serve different purposes and some can be harmful - doing the research is helpful.
I have cervical dystonia where my head has tremors 24/7. Tremors weakened the bones in my neck, which is where bone density tests reveal bone degradation. I’ve dealt with other health issues that probably stripped my body of calcium, but I’ve changed my diet to resolve those issues.