Well, in my research I have come to the conclusion that we don't need anywhere near as much calcium as the RDA calls for, but we do need the cofactors like boron, magnesium, vit d, silica, etc. Nourishing herbal infusions made from nettles, oatstraw, red raspberry leaf are great, as are green vegetables like collards and broccoli, sesame seeds, bone broth, etc.