I haven't been taking this long enough to know if my bone density has stabilized or possibly gotten better, but I do know that my fingernails have FINALLY started to grow! They were peeling & chipping and would never grow out & now they are fairly strong & have gained length. I've been taking the product for almost 3 months. The only complaint is the SIZE! I have a swallowing problem & would love it if this product was available in capsules. I cut them in two, but that doesn't help a lot. Plus, some of the product is lost by severing the pill. I will continue to take them to see if my bone density gets any better. I don't think there is a better product on the market.