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Our bodies can only use 400 mg every 4 hrs, for a total of 1,200 mg / day for senior women, from what I have found on credible websites.
Raking more at once or exceeding the upper limit can have bad effects like high blood calcium level &/or kidney stones.
So what does my idioit dr do? Rxs me 600 mg/day in 1 pill, 1.5 yrs AFTER osteopenia diagnosis. 
Best of luck to you!
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