There's so many formulas on the market that I think the most important thing is go with a really reputable manufacturer that has been in business for a long time and ships interstate. The interstate caveat means that Federal guidelines apply so there's an implied higher standard of protection against poor quality or fraudulent products. I take something called Bone Support, which used to be called Bone Formula, which includes what I think of as the bone support trilogy of algae-sourced calcium, vitamin D3, and vitamin K2. I put a friend on it after he suffered a broken neck and his neurosurgeon noticed the bottle on his hospital bedside table and picked it up, read the formula and thought it was a really good supplement that also might help speed up bone healing. [I didn't ask why, if this was so important, no doctor suggested it. I pick my battles :-)]

I recently added silica to my daily regime, in the form of Bio-Sil, because a lot of data that suggests silica is really important and, though I eat more vegetables than I used to, I don't know how many trace minerals vegetables absorb in the growing process nor the quality of soil the vegetables are grown in for that matter though I buy most of the stuff at a local farmers market now. I don't know if the silica is helping my bones but it sure is making my hair grow a lot faster.

I would add one caveat. I never order anything from Amazon that goes in my body. And have also stopped ordering anything that is applied topically. I have twice received products sold via Amazon that were clearly not the brand name I was used to seeing though in the brand name labeled container. I think the Netflix documentary on fraudulent products on Amazon highlights some of the risk. I do read the reviews on Amazon but, when it comes to supplements or skin care products, and many other products, for that matter, I ordered directly from the manufacturer. The distribution chain chaos makes it very easy to sell counterfeit and sometimes outright dangerous goods. Caveat emptor.