@sebutler The calcium & Vit D story may be more complicated. As usual, there are no clear easy answers on these complex subjects around osteoporosis. Based on other things that I have read it does seem that, unless you have a deficiency, merely taking calcium & Vit D will not help bone building. A recent RCT trial concluded the same thing about protein; protein does not help in isolation. But if you suddenly start doing LIFTMOR type weight lifting then those nutrition elements may play a role.

I cannot read the actual main article due to paywall, only the abstract. But the AI says, when asked:
"No, vitamin K supplements were not used in the studies referenced by this meta-analysis. The systematic review and meta-analysis focused specifically on evaluating the efficacy of isolated combined calcium and vitamin D supplementation."

But this next article describes a BMD effect of calcium & Vit K.
The combined effect of vitamin K and calcium on bone mineral density in humans: a meta-analysis of randomized controlled trials
https://link.springer.com/article/10.1186/s13018-021-02728-4
EXCERPT: "Conclusion
The combination of vitamin K and calcium has a positive effect on lumbar BMD and decreases the level of UcOC."

Personally, I plan to concentrate on actions with better proof of effectiveness, such as impact + heavy-for-me weight/resistance training exercise and Vitamin MK-4 & MK-7. I will continue other modest steps such as trying to get 1200 mg of calcium per day, supplementing food intake with inexpensive calcium citrate when what I eat falls short. When my T-scores get bad enough (all of mine are better than -2.9) I plan for teriparatide (e.g. brand Forteo) followed by romosozumab (brand name Evenity). Maybe oral teriparatide will be proven and approved by then!