I take additional D3 and have blood work to check levels of both D and calcium. My D was low before I started supplements. Calcium is good and I have veins checked annually. Thanks for the comment.

@normahorn I didn't count it twice (see the bottom of the label) but I did make a mistake in what the composition of MCH is (it is 25% elemental calcium). Apologies. The important thing is that @dwolf's tested levels were fine. I was curious what the label means and what this supplement includes though. My mother took it for quite awhile.

The bottle label says https://femologist.com/products/bone-support#ingredients

Calcium (from microcrystalline hydroxyapatite) 1000 mg 77%

then below the line microcrystalline hydroxyapatite 4,000 mg

Here is info on dosing:
A typical dose of microcrystalline hydroxyapatite compound is eight 500 mg capsules; each capsule contains 125 mg elemental calcium, for a daily total of 1000 mg elemental calcium.

So the 4,000mg microcrystalline hydroxyapatite on the bottom of the label is actually 1,000 mg elemental calcium . But the calcium from microcrystalline hyroxyapatite higher up on the label says that 1,000 mg is 77% of the daily requirement, which is 924mg.

So the total for a daily dose of Bone Maximizer III would seem to be 1924mg calcium

I did think that microcrystalline hyroxypatite was just another form of calcium, but it seems the elemental calcium in it is 25% of the total mg. It still seems a little high but not as high as I first thought so again apologies!

I am curious about this supplement, since it has been mentioned in articles as helpful to us. It has other compounds besides calcium which are listed on the label. Thanks for introducing this!

Pub Med
"As an alternative to calcium, ossein hydroxyapatite compound is a complex protein mineral that has higher osteogenic effect when compared with mineral compounds or calcium supplement administered orally. Ossein hydroxyapatite provides benefits in the treatment and prevention of osteopenia and osteoporosis in women, including primary and secondary osteoporosis. Various studies suggest that ossein hydroxyapatite is more effective than calcium carbonate in reducing bone loss in postmenopausal women and in preventing bone loss as well."