There seems to be significant evidence building that collagen supplements help to strengthen bone. I haven't seen any large scale studies yet, but all the smaller ones are uniformly positive. It seems that all that remains to be shown is exactly which peptides, and the ideal dose...
Like over half of the older adults in the US, I am at risk of osteoporosis. I do not have it, but nearly every other female over 45 in my mother's extended family does. So for many years I have done everything in my power to avoid it - I eat a very healthy diet, with dairy and dark leafy greens as well as plenty of protein. I do weight-bearing activities and exercises regularly. I take calcium with Vitamin D & magnesium, and for the past year, collagen.T

After reading for over a month, I settled on a formula that has collagen types 1, 2, 3, 5 & 10 to cover all possible bases - bone, skin, hair & nails. My hair & nails are definitely stronger, my old skin (which has had a lot of sun exposure) is less fragile and prone to random scrapes and tears. So, hopefully, it is helping me on the inside as well.

This is an interesting topic, and who knows, may someday have an impact on preventing or treating osteoporosis.
Sue
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I started taking Dr McCormick's collagen (OsteoNaturals brand name) several months ago. It's a great product...unflavored, tasteless and mixes in both hot and cold liquids. The price is comparable to other products out there, and I trust Dr McCormick's recommendation. Don't know if it's helping my bones yet, but it can't hurt. For me, every little bit counts!