i agree with a lot of the dietary suggestions. vitamin k2 through raw chard and natto (fermented non-GMO soy) and horsetail to get the highest silica herb.
i would add the high silica and alkalizing content of the mighty cucumber
so delicious at add into smoothies....
and let us not forget about the wonderful weight bearing exercise of qigong and tai chi. lots of studies coming out of the bone density improvement through these ancient practices.