I supplement my calcium because I cannot eat enough of it on my diet (No sugar diet). I take magnesium, boron, vitamin D3 (4,000 IU daily), and vitamin K2 (mk4 and mk7). That's what I am doing for my bones. And since my DEXA scan was -5.7, I am also doing a low dose of estrogen and progesterone. Next time I find the medical journal paper I have about estrogen and osteoporosis, I will post it. I don't have a strong family history of cancer. Colon cancer was big in our family, but going off sugar seems to be working for that.