@daisy17 Fortibone brand of "Type 1 specific collagen peptides" was the collagen supplement used in at least one study, as below. But you can get "Type 1 specific collagen peptides" from other brands, and other studies used those other sources. See the reference to the meta-analysis in my other post.

Here is a study happened to use Fortibone, but they do not mention that brand in the conclusion section.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5793325/
EXCERPT: "5. Conclusions
In conclusion, the findings of this randomized, placebo-controlled trial demonstrate, that supplementation with 5 g of specific collagen peptides significantly increases bone mineral density of the lumbar spine and the femoral neck as well as blood levels of the bone marker, P1NP, in postmenopausal women with age-related decline in BMD."

I have used various brands over the years depending on prices or special deals or how much of the Collagen Peptides (CP) it contained. For example, the last bag I bought was Sparkle Wellness which contains 10g CP per serving of CP and that CP happens to be Fortibone. But the study referenced below used only 5g of CP, so I took only half the amount stated on the Sparkle bag.

An here is another of what I am coming to expect is typical result of "looks good, but more expensive research desired".
https://pmc.ncbi.nlm.nih.gov/articles/PMC11842160/
EXCERPT: "Collagen supplementation demonstrates promising results. ... Future research should prioritize standardized protocols and consistent outcome measures."

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So it boils down to potential benefit vs cost and risk of using CP supplements. I have not dug into CP as much as I have MK4. When is this osteoporosis journey ever easy?