That was in the findings of the first linked study of postmenopausal women. But the particulars of the thing are too far beyond me. One thing I noticed in that study is that they supplemented with calcium carbonate. The claim has been that the calcium in calcium citrate is much more absorbed than the calcium in calcium carbonate.
So, does that have anything to do with developing kidney stones? I have no idea. I post these articles for whom they may help and leave them to their own research.
We pre-specified the following study level variables for entry into this interaction analysis: vitamin D daily dose equivalent, route (oral or intramuscular), and co-administration of calcium. We then used variables that interacted significantly to stratify the subsequent fixed effects Cox fracture-free survival analysis, which contained a series of dummy variables to capture residual differences in risk of fracture between trials. A subgroup analysis by dose (10 µg/day v 20 µg/day) was pre-specified. We thus classified the Meyer, Larsen, and Women’s Health Initiative (WHI) studies as 10 µg studies and classified the Smith study (equivalent to 20.5 µg/day), the Lyons study, the RECORD study, and the Porthouse study (all equivalent to 20 µg/day) as 20 µg studies. Observations were truncated after 36 months; only the WHI study provided sufficient patients to populate the analysis beyond this.
BRAVO!!! Thank you for finding the original article.
That's a puny amount of vitamin D. Or is it? Converting micrograms, µg, of vitamin D to international units(IU) says 10 µg equals 400 IU. That's the smallest vitamin D supplement that I've seen.
Look up opening a link in a new window.
It helps me posting and following an argument.